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# Man's physical universe

## UNIT VI SECTION 6

UNIT VI SECTION 6 ILLUMINATION IS THE CHIEF APPLICATION OF ARTIFICIAL LIGHT Introduction. Illumination deals with the problems of what kind of light sources to use for a given purpose, how much light is required, how the amount of light present can be measured, and where light sources should be placed. Tremendous strides have been made in the science of illumination, and yet few homes are properly illuminated. Proper illumination is desirable because it saves eyestrain. In this age, when the eyes are used so much in reading and close work, it is very important that everything possible be done to relieve the eyes from unnecessary strain. Illuminating Power Is Now Measured in Terms of Lumens. The value of any light source for illumination depends upon how much light it gives out. The unit of intensity is called the candle, which is equal to the intensity of a standard candle burning under -~:3Q-:::::::_t Fig. 215. Light intensity is inversely proportional to the square of the distance from the source. specified conditions. The international candle is now defined to be the light with an illuminating power equal to one tenth of that of a standard gas light produced by a Harcourt pentane lamp. Obviously the intensity of the light from a burning candle depends upon the distance one is from it, so that one must incorporate the idea of distance into the measurement of illuminating power. Afoot-candle is the most con- 442

ILLUMINATION 443 venient unit of intensity; it represents the intensity of a candle light at a distance of one foot from the candle. The lumen is now replacing candle power in measuring illumination. The lumen is really a light energy unit; it measures the quantity as well as the intensity of light because it combines the idea of area with intensity. The lumen is the amount of light falling upon a surface which has an area of one square foot when every point of the area is one foot from the light of one standard candle. The lumen corresponds to the ampere used in measuring the rate of flow of electricity, in that it measures the rate of flow of light energy. Light intensities are expressed in lumens per square foot or in foot-candles. The Measurement of Illumination Is a Common Occurrence, Especially in Photography. The strength of a light source is measured by a photometer. In the simple photometer used by Rumford, the distance of two light sources from a rod is varied until the shadows are of equal intensity. The relative strengths of the two light sources can then be computed on the basis of their relative distances from the rod. The intensity of light is now measured for photographic purposes by means of light-meters, which the photographer calls exposure meters. These are simply photoelectric cells in circuit with sensitive galvanometers which measure the electric current from the photoelectric cell when light shines upon it. Photoelectric cells will be discussed in a later section. The intensity of light may also be measured by actinometers, which measure the amount of a substance produced in a chemical reaction in a given time as a result of exposure of the reactants to light. The Amount of Light Required Depends upon the Person and What He Is Doing. Different persons require different amounts of light, depending upon their sensitiveness to light. Certain conditions of eyestrain will cause such a sensitivity to light that people so afflicted can scarcely stay in the room that is adequately illuminated for other people. As a rule, older people require more light than young people. The amount of light required for good illumination also depends upon the nature of the operation involved. The following values represent good lighting practice: 3 foot-candles — stairways, passageways, etc. 3-10 foot-candles — power plants, elevators, etc. 5-10 foot-candles — general household-work.

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THE MACMILLAN COMPANY NEW YORK •

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VI PREFACE the origin and evolution

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viii PREFACK which the student sele

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Preface Acknowledgments CONTENTS PA

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CONTENTS Section 7. Coal Has Become

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; INTRODUCTION In so far as man dev

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4 THE INTELLIGENT SOLUTION OF PROBL

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6 THE INTELLIGENT SOLUTION OF PROBL

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. 8 THE INTELLIGENT SOLUTION OF PRO

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10 THE INTELLIGENT SOLUTION OF PROB

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12 THE INTELLIGENT SOLUTION OF PROB

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14 THE INTELLIGENT SOLUTION OF PROB

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16 THE INTELLIGENT SOLUTION OF PROB

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18 THE INTELLIGENT SOLUTION OF PROB

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UNIT I SECTION 3 THE SUPREME CONTRI

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22 THE INTELLIGENT SOLUTION OF PROB

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24 THE INTELLIGENT SOLUTION OF PROB

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26 THE INTELLIGENT SOLUTION OF PROB

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UNIT I SECTION 4 OBSERVATIONS MUST

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30 THE INTELLIGENT SOLUTION OF PROB

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32 THE INTELLIGENT SOLUTION OF PROB

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34 THE INTELLIGENT SOLUTION OF PROB

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36 THE INTELLIGENT SOLUTION OF PROB

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38 THE INTELLIGENT SOLUTION OP' PRO

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40 THE INTELLIGENT SOLUTION OF PROB

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UNIT I SECTION 6 STRAIGHT THINKING

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44 THE INTELLIGENT SOLUTION OF PROB

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46 THK INTFLLIGENT SOLUTION OF PROB

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48 THE INTELLIGENT SOLUTION OF PROB

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UNIT II THE UNIVERSE IS A VAST SYST

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54 THE UNIVERSE A VAST SYSTEM OF PA

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50 THE UNIVERSE A VAST SYSTEM OF PA

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58 THE UNIVERSE A VAST SYSTEM OF PA

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60 THE UNIVERSE A VAST SYSTEM OF PA

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62 THE UNIVERSE A VAST SYSTEM OF PA

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64 THE UNIVERSE A VAST SYSTEM OF PA

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66 THE UNIVERSE A VAST SYSTEM OF PA

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08 THE UNIVERSE A VAST SYSTEM OF PA

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70 THE UNIVERSE A VAST SYSTEM OF PA

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11 THE UNIVERSE A VAST SYSTEM OF PA

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74 THK UNIVKRSK A VAST SN'STKM OF P

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76 THK rMX'ERSE A VAST SYSTEM OF PA

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78 THE UNIVERSE A VAST SYSTEM OF PA

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80 THE UNIVERSE A VAST SYSTEM OF PA

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82 THE UNIVERSE A VAST SYSTEM OF PA

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84 THE UNIVERSE A VAST SYSTEM OF PA

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UNIT II SECTION 5 THE EARTH RECEIVE

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; 88 THE UNIVERSE A VAST SYSTEM OF

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91) THE UNIVERSE A VAST SYSTEM OF P

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92 THE UNIVERSE A VAST SYSTEM OF PA

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94 THE UNIVERSE A VAST SYSTEM OF PA

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96 THE UNIVERSE A VAST SYSTEM OF PA

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98 THE UNI\'i:i

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100 THE UNIVERSE A VAST SYSTEM OF P

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102 THK I'MX i:KSh: A VAST SWSri-.M

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104 THE UNIVERSE A VAST SYSTEM OF P

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106 THK UNIX'KRSK A \'AST SYSTEM OF

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108 THE UNIVERSE A VAST SYSTEM OF P

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no THE UNIVERSE A VAST SYSTEM OF PA

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; 112 THE UNIVERSE A VAST SYSTEM OF

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114 THE UNIVERSE A VAST SYSTEM OF P

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116 THE UNIVERSE A VAST SYSTEM OF P

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UNIT II SECTION 9 ASTRONOMICAL MEAS

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120 THE UNIV^ERSE A VAST SYSTEM OF

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122 THK UNIVERSE A VAST SYSTEM OF P

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124 THE UNIVERSE A VAST SYSTEM OF P

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126 THE EARTH AS MAN'S ABODE coolin

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128 THE EARTH AS MAN'S ABODE As evi

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130 THE EARTH AS MAN'S ABODE It is

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UNIT III SECTION 2 THE NATURE OF TH

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l.U THE EARTH AS MAN'S ABODE of the

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136 THE EARTH AS MAN'S ABODE Inasmu

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UNIT III SECTION 3 THE PRINCIPAL AG

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140 THE EARTH AS MAN'S ABODE China

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142 THE EARTH AS MAN'S ABODE within

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144 THE EARTH AS MAN'S ABODE Zealan

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146 THE EARTH AS MAN'S ABODE changi

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UNIT III SECTION 4 THE CHARACTERIST

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150 THE EARTH AS MAN'S ABODE stream

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152 THE EARTH AS MAN'S ABODE majori

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154 THE EARTH AS MAN'S ABODE Glacie

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156 THE EARTH AS MAN'S ABODE 1891,

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158 THE EARTH AS MAN'S ABODE type o

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16() THK EARTH AS MAN'S ABOUK The t

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162 THK EARTH AS MAN'S ABODF: River

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164 THE EARTH AS MAN'S ABODE Tambor

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166 THK EARTH AS MAN'S ABODE STUDY

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168 THE EARTH AS MAN'S ABODE study

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170 THK KARTH AS MAN'S ABODE fossil

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172 THE EARTH AS MAN'S ABODE The Hi

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174 THE EARTH AS MAN'S ABODE Synops

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176 THE EARTH AS MAN'S ABODE the we

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; UNIT III SECTION 7 GEOLOGICAL PRO

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180 THE EARTH AS MAN'S ABODE minera

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182 THE EARTH AS MAN'S ABODE presen

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UNIT III SECTION 8 GEOLOGICAL PROCE

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186 THE EARTH AS MAN'S ABODE ore (b

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188 THE EARTH AS MAN'S ABODE The ma

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190 THE EARTH AS MAN'S ABODE sedime

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' U. S. Soil Conservation Service.

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194 thf: karth as man's abode act o

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196 THK KARTH AS MAN'S ABODK The Na

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IW Tin: KARTH AS MAN'S ABODE built

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200 THE EARTH AS MAN'S ABODE Man's

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202 THE EARTH AS MAN'S ABODI-: full

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UNIT IV SECTION 1 MATTER IN THE GAS

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MATTER IN THE GASEOUS STATE 207 The

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MATTER IN THE GASEOUS STATE 209 by

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MATTER IN THE GASEOUS STATE 211 eas

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UNIT IV SECTION 2 A KNOWLEDGE OF TH

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THE PROPERTIES OF LIQUIDS 215 liqui

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THE PROPERTIES OF LIQUIDS 217 The s

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UNIT IV SECTION 3 THE PHYSICAL PROP

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THE PHYSICAL PROPERTIES OF SOLIDS 2

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THE PHYSICAL PROPERTIES OF SOLIDS 2

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THE PHYSICAL PROPERTIES OF SOLIDS 2

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THE ABSORPTION OR EVOLUTION OF HEAT

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THE ABSORPTION OR EVOLUTION OF HEAT

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THE ABSORPTION OR EVOLUTION OF HEAT

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UNIT IV SECTION 5 PHYSICAL PROPERTI

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THE KINETIC- MOLECULAR THEORY 235 2

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THE KINETIC-MOLECULAR THEORY 237 Th

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THE KINETIC-MOLECULAR THEORY 239 cu

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REGULARITIES OF SOLUTIONS 241 3. Co

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supersaturated solutions. REGULARIT

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REGULARITIES OF SOLUTIONS 245 stanc

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REGULARITIES OF SOLUTIONS 247 tant

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REGULARITIES OF SOLUTIONS 249 4. Wh

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CLIMATE AND WEATHER 251 vary becaus

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CLIMATE AND WEATHER 253 orbit. For

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CLIMATE AND WEATHER 255 refers to t

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CLIMATE AND WEATHER 257 high suscep

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CLIMATE AND WEATHER 259 twenty-five

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CLIMATE AND WEATHER 261 per hour. A

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CLIMATE AND WEATHER 263 6. Explain

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WEATHER-FORECASTING 265 The cup ane

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WEATHER-FORECASTING 267 ditions. Dr

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WEATHER-FORECASTING 269 before turn

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WEATHER-FORECASTING 271 Air-mass An

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which ice will form. WEATHER-FORECA

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AIR CONDITIONING 275 Paul then expe

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AIR CONDITIONING 277 is merely a de

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Silica gel is AIR CONDITIONING 279

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AIR CONDITIONING 281 operated by th

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AIR CONDITIONING 283 Heat conductiv

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AIR CONDITIONING 285 quite comforta

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UNIT V MAN HAS DISCOVERED AND HARNE

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UNIT V SECTION 1 ENERGY MANIFESTS I

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ENERGY MANIFESTS ITSELF IN MANY FOR

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ENERGY MANIFESTS ITSELF IN MANY FOR

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ENERGY MANIFESTS ITSELF IN MANY FOR

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UNIT V SECTION 2 THE PRUDENT UTILIZ

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THE CONSERVATION OF OUR ENERGY RESO

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THE CONSERVATION OF OUR ENERGY RESO

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THE CONSERVATION OF OUR ENERGY RESO

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THE CONSERVATION OF OUR ENERGY RESO

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UNIT V SECTION 3' MODERN MACHINES H

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MACHINES HAVE RAISED LIVING-STANDAR

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MACHINES HAVE RAISED LIVING-STANDAR

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MACHINES HAVE RAISED LIVING-STANDAR

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MACHINES HAVE RAISED LIVING-STANDAR

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MACHINES HAVE RAISED LIVING-STANDAR

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MACHINES HAVE RAISED LIVING-STANDAR

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MACHINES HAVE RAISED LIVING-STANDAR

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TRANSPORTATION HAS BEEN REVOLUTIONI

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TRANSPORTATION HAS BEEN REVOLUTIONI

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TRANSPORTATION HAS BEEN REVOLUTIONI

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THE INTERNAL-COMBUSTION ENGINE 329

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THE INTERNAL-COMBUSTION ENGINE 331

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THE INTERNAL-COMBUSTION ENGINE 333

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THE INTERNAL-COMBUSTION ENGINE 335

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THE INTERNAL-COMBUSTION ENGINE 337

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THE INTERNAL-COMBUSTION ENGINE 339

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UNIT V SECTION 6 THE AUTOMOBILE TYP

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THE AUTOMOBILE 343 consolidations o

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THE AUTOMOBILE 345 same survey show

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THE AUTOMOBILE 347 tenance costs in

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THE AUTOMOBILE 349 Buying oil on th

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THE AUTOMOBILE 351 STUDY QUESTIONS

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AIRPLANE A TRIUMPH OF MODERN SCIENC

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AIRPLANE A TRIUMPH OF MODERN SCIENC

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AIRPLANE A TRIUMPH OF MODERN SCIENC

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AIRPLANE A TRIUMPH OF MODERN SCIENC

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AIRPLANE A TRIUMPH OF MODERN SCIENC

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AIRPLANE A TRIUMPH OF MODERN SCIENC

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UNIT V SECTION 8 FLYING AN AIRPLANE

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AERODYNAMICS 367 Weight, i.e.^ a me

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AERODYNAMICS 369 The Venturi tube i

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AERODYNAMICS 371 An airfoil is any

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AERODYNAMICS 373 right. After attai

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AERODYNAMICS 375 An Airplane Practi

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UNIT V SECTION 9 AVIGATION IS THE S

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AVIGATION 379 Aeronautical charts a

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AVIGATION 381 a chart the distance

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AVIGAT ION 383 instructors and comm

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UNIT VI ENERGY MAY BE PROPAGATED TH

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388 ENERGY MAY BE PROPAC.AIED BY VI

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390 ENERGY MAY BE PROPAGATED BY VIB

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492 MAGNETISM AND ELECTRICITY pheno

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UNIT VII SECTION 3 AN ELECTRIC CURR

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496 MAGNETISM AND ELECTRICITY solut

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408 MAGNETISM AND ELECTRICITY Ohm's

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5CK) MAGNETISM AND ELECTRIC I IN ^A

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UNIT VII SECTION 4 THE DISCOVERY OF

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504 MAGNETISM AND ELECTRICITY A Coi

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506 MAGNETISM AND ELECTRICITY and t

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. 508 MAGNETISM AND ELECTRICITY 7.

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510 MAGNETISM AND ELECTRICITY the f

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512 MAGNETISM AND ELECTRICITY used.

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514 MAGNETISM AND ELECTRICITY The t

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518 MAGNETISM AND ELECTRICITY the n

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520 MAGNETISM AND ELECTRICITY STUDY

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522 MAGNETISM AND ELECTRICITY ignit

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524 MAGNETISM AND ELECTRICITY with

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526 MAGNETISM AND ELECTRICITY rents

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528 MAGNETISM AND ELECTRICITY well'

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530 MAGNETISM AND ELECTRIC ITV read

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B, ; 532 MAGNETISM AND ELECTRICITY

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534 MAGNETISM AND ELECTRICITY loud-

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536 MAGNETISM AND ELECTRICITY frequ

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I 538 MAGNKTISM AND I:LI{CTRIC1T\ S

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540 MAGNETISM AND ELECTRICITY The e

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542 MAGNETISM AND KLKCTRK ITY silve

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UNIT VII SECTION 9 ELECTRICAL CONDU

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I 546 MAGNETISM AND ELECTRICITY tub

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548 MAGNETISM AND KLKCTRICITY that

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! 550 MAGNETISM AND FXECTRICITY tha

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I 552 MAGNETISM AND ELECTRICITY fou

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i

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556 MAN IS MASTERING HIS MATERIAL W

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558 MAN IS MASTERING HIS MATERIAL W

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. ; 560 MAN IS MASTKRING HIS MATERI

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562 MAN IS MASTERING HIS MATERIAL W

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564 MAN IS MASTKRIXG HIS MATKRIAL W

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I 566 MAN IS MASTERING HIS MATERIAL

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568 MAN IS MASTKRING HIS MATKRIAL W

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570 MAN IS MASTERING HIS MATERIAL W

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572 MAN IS MASTERING HIS MATERIAL W

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574 MAN IS MASTERING HIS MATERIAL W

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576 MAN IS MASTERINC; HIS MATERIAL

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578 MAN IS MASTERING HIS MATERIAL W

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580 MAN IS MASTERING HIS MATERIAL W

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582 MAN IS MASTERING HIS MATERIAL W

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5S4 MAN IS MASTERING HIS MATERIAL W

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UNIT VIII SECTION 5 ELECTROVALENT R

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588 MAN IS MASTERING HIS MATERIAL W

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UNIT VIII SECTION 6 ATOMS DIFFER IN

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592 MAX IS MASTERING HIS MATERIAL W

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594 MAN IS MASTERING HIS MATERIAL W

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596 MAN IS MASTERING HIS MATERIAL W

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I gain 598 MAN IS MASTERING HIS MAT

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600 MAN IS MASTERING HIS MATERIAL W

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602 MAN IS MASTERING HIS MATERIAL W

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I 604 MAN IS MASTERING HIS MATERIAL

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606 MAN IS MASTERING HIS MATERIAL W

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— : 608 MAN IS MASTERING HIS MATE

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UNIT VIII SECTION 9 COVALENT REACTI

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I I I I I II H H H H 612 MAN IS MAS

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1 H 614 MAN IS MASTERING HIS MATERI

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: I OC I 616 MAN IS MASTERING HIS M

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618 MAN IS MASTERING HIS MATERIAL W

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620 MAN IS MASTERING HIS MATERIAL W

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UNIT IX SECTION 1 OXYGEN AND SULFUR

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OXYGEN AND SULFUR, CARBON AND SILIC

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OXYGEN AND SULFUR, CARBON AND SILIC

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: OXYGEN AND SULFUR, CARBON AND SIL

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OXYGEN AND SULFUR, CARBON AND SILIC

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OXYGEN AND SULFUR, CARBON AND SILIC

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METALLURGY 635 flotation. Many impr

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METALLURGY 637 have been investigat

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METALLURGY 639 twenty years. Copper

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METALLURGY 641 Aluminum and its all

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METALLURGY 643 6. List ten metals a

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COMBUSTION 645 heat is dispersed ne

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Carbon Monoxide Is a Dangerous Pois

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COMBUSTION 649 Huge thermite incend

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COMBUSTION 651 is much used in indu

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COMBUSTION 653 their other properti

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UNIT IX SECTION 4 AIR AND WATER ARE

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AIR AND WATER AS RAW MATERIALS 657

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AIR AND WATER AS RAW MATERIALS 659

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AIR AND WATER AS RAW MATERIALS 661

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AIR AND WATER AS RAW MATERIALS 663

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"BETTER THINGS" FROM CELLULOSE 665

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"BETTER THINGS" FROM CELLULOSE 667

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"BETTER THINGS" FROM CELLULOSE 669

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"BETTER THINGS" FROM CELLULOSE 671

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"BETTER THINGS" FROM CELLULOSE 67 3

• Page 693 and 694:

SYNTHETIC PLASTICS 675 of flooring,

• Page 695 and 696:

SYNTHETIC PLASTICS 677 furfural in

• Page 697 and 698:

SYNTHETIC PLASTICS 679 for textile

• Page 699 and 700:

SYNTHETIC PLASTICS 681 elastic qual

• Page 701 and 702:

SYNTHETIC PLASTICS 683 natural gas.

• Page 703 and 704:

SYNTHETIC PLASTICS 685 powerful int

• Page 705 and 706:

SYNTHETIC PLASTICS 687 which is one

• Page 707 and 708:

"BETTER THINGS" FROM COAL 689 of 19

• Page 709 and 710:

"BETTER THINGS" FROM COAL 691 perfu

• Page 711 and 712:

"BETTER THINGS" FROM COAL 693 Coal

• Page 713 and 714:

UNIT IX SECTION 8 THE ALREADY VERY

• Page 715 and 716:

"BETTER THINGS" FROM PETROLEUM 697

• Page 717 and 718:

"BETTER THINGS" FROM PETROLEUM 699

• Page 719 and 720:

"BETTER THINGS" FROM PETROLEUM 701

• Page 721 and 722:

"BETTER THINGS" FROM PETROLEUM 703

• Page 723 and 724:

UNIT IX SECTION 9 NATURAL AND SYNTH

• Page 725 and 726:

NATURAL AND SYNTHETIC RUBBERS 707 2

• Page 727 and 728:

NATURAL AND SYNTHETIC RUBBERS 709 e

• Page 729 and 730:

NATURAL AND SYNTHETIC RUBBERS 711 I

• Page 731 and 732:

NATURAL AND SYNTHETIC RUBBERS 713 t

• Page 733:

NATURAL AND SYNTHETIC RUBBERS 715 5

• Page 737 and 738:

UNIT X SECTION 1 PHOTOSYNTHESIS STO

• Page 739 and 740:

I H I H C PHOTOSYNTHESIS STORES ENE

• Page 741 and 742:

PHOTOSYNTHESIS STORES ENERGY 723 th

• Page 743 and 744:

UNIT X SECTION 2 FOODS ARE THE RAW

• Page 745 and 746:

FOODS 727 charged plates which caus

• Page 747 and 748:

FOODS 729 to particles which are vi

• Page 749 and 750:

FOODS 731 roots by dialysis. The we

• Page 751 and 752:

FOODS 733 Plants, like animals, req

• Page 753 and 754:

FOODS 735 although the necessity fo

• Page 755 and 756:

FOODS 737 regardless of whether the

• Page 757 and 758:

VITAMINS, ENZYMES, AND HORMONES 739

• Page 759 and 760:

Vitamins VITAMINS, ENZYMES, AND HOR

• Page 761 and 762:

VITAMINS, ENZYMES, AND HORMONES 743

• Page 763 and 764:

VITAMINS, ENZYMES, AND HORMONES 745

• Page 765 and 766:

VITAMINS, ENZYMES, AND HORMONES 747

• Page 767 and 768:

VITAMINS, ENZYMES, AND HORMONES 749

• Page 769 and 770:

CHEMICAL WARFARE USED TO COMBAT INS

• Page 771 and 772:

CHEMICAL WARFARE USED TO COMBAT INS

• Page 773 and 774:

CHEMICAL WARFARE USED TO COMBAT INS

• Page 775 and 776:

NATURALLY OCCURRING SOLUBLE SALTS 7

• Page 777 and 778:

NATURALLY OCCURRING SOLUBLE SALTS 7

• Page 779 and 780:

NATURALLY OCCURRING SOLUBLE SALTS 7

• Page 781 and 782:

NATURALLY OCCURRING SOLUBLE SALTS 7

• Page 783 and 784:

NATURALLY OCCURRING SOLUBLE SALTS 7

• Page 785 and 786:

UNIT X SECTION 6 CHEMISTRY HAS PROV

• Page 787 and 788:

C I I C C I I H I — H H C I I I C

• Page 789 and 790:

C I H C I H C H CHEMISTRY AND THE C

• Page 791 and 792:

C I I I H CHEMISTRY AND THE CONTROL

• Page 793 and 794:

CHEMISTRY AND .THE CONTROL OF DISEA

• Page 795 and 796:

UNIT X SECTION 7 THE RELIEF OF PAIN

• Page 797 and 798:

C RELIEF OF PAIN REVOLUTIONIZED SUR

• Page 799 and 800:

C H C II I I H H— H— RELIEF OF

• Page 801 and 802:

I I I I I I I C H H C H C H H RELIE

• Page 803 and 804:

C I H C I H RELIEF OF PAIN REVOLUTI

• Page 805 and 806:

C H C H C I H H RELIEF OF PAIN REVO

• Page 807 and 808:

RELIEF OF PAIN REVOLUTIONIZED SURGE

• Page 809 and 810:

PROTOPLASMIC AND CELLULAR ORGANIZAT

• Page 811 and 812:

" PROTOPLASMIC AND CELLULAR ORGANIZ

• Page 813 and 814:

PROTOPLASMIC AND CELLULAR ORGANIZAT

• Page 815 and 816:

THE PROGRESS OF CIVILIZATION 797 wo

• Page 817 and 818:

THE PROGRESS OF CIVILIZATION 799 to

• Page 819 and 820:

THE PROGRESS OF CIVILIZATION 801 ST

• Page 821 and 822:

CONCLUSION 803 majority of students

• Page 823 and 824:

BIBLIOGRAPHY UNIT I Author Bernal,

• Page 825 and 826:

Author BIBLIOGRAPHY 807

• Page 827 and 828:

Author BIBLIOGRAPHY 809

• Page 829 and 830:

BIBLIOGRAPHY 811 Author National Re

• Page 831 and 832:

BIBLIOGRAPHY 813 Author Rhodes, F.

• Page 833 and 834:

Author BIBLIOGRAPHY 815

• Page 835 and 836:

INDEX Abrasives, 760 Absolute zero,

• Page 837 and 838:

1 INDEX 819 irreversible, 593 photo

• Page 839 and 840:

INDEX 821 Dynamite, 669 Dynamo, 515

• Page 841 and 842:

INDEX 823 Hardening, 637 Hardness,

• Page 843 and 844:

INDEX 825 Local anaesthetics, 771,

• Page 845 and 846:

INDEX 827 Periodicity, 568 Periodic

• Page 847 and 848:

INDEX 829 Roentgen, W. R., 546 Roll

• Page 849 and 850:

INDEX 831 Thunderstorms, 268, 489 T

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