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Man's physical universe

UNIT IV SECTION 1 MATTER

UNIT IV SECTION 1 MATTER IN THE GASEOUS STATE EXHIBITS MANY INTERESTING PHYSICAL PROPERTIES Introduction. It seems almost incredible that the idea of the existence of matter in the gaseous state was unknown until the past few hundred years. Man lives in a gaseous ocean and breathes air which is a mixture of gases. There Are Two Types of Properties. Matter is described in terms of its properties. There are two types of properties, physical and chemical. Physical properties are those whose manifestation appears to be unaccompanied by any change of composition. Thus the freezing- and boiling-points ^ of water are physical properties. The color and crystalline form of sugar are other examples of physical properties. Such properties as color, odor, taste, density, solubility, hardness, ductility, expansibility, melting- and boiling-points, heat and electrical conductivity, and specific heat are physical properties. The second group of properties, chemical properties, are those which express the capacity of a material for being transformed into other materials. Thus the ability of gasoline or of wood to burn, or of iron to rust, is a chemical property. Chemical properties tell with what a material reacts (if the change involves a reaction with other substances), under what conditions it reacts, what materials are produced by the change, how much of the materials are involved in the change, and how much energy is used up or evolved in the process. A Knowledge of the Properties of Matter Is Important. Scientists spend a great deal of time in observing and measuring the properties of matter. The properties of matter determine its ' The freezing- and boiling-points of lir4uids are those temperatures (points on thermometers) at which liquids freeze or boil, respectively. 205

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    THE MACMILLAN COMPANY NEW YORK •

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    Revised Edition Copyrighted, 1943.

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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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    254 PHYSICAL LIMITATIONS HAVE BEEN

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    256 PHYSICAL LIMITATIONS HAVP: BEEN

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    258 PHYSICAL LIMITATIONS HAVE BEEN

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    260 PHYSICAL LIMITATIONS HAVE BEEN

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    262 PHYSICAL LIMITATIONS HAVE BEEN

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    UNIT IV SECTION 8 SCIENTIFIC WEATHE

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    266 PHYSICAL LIMITATIONS HAVE BEEN

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    268 PHYSICAL LIMITATIONS HAVE BEEN

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    270 PHYSICAL LIMITATIONS HAVE BEEN

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    272 PHYSICAL LIMITATIONS HAVE BEEN

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    UNIT IV SECTION 9 MAN PRODUCES HIS

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    : _ . — 276 PHYSICAL LIMITATIONS

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    • F 278 PHYSICAL LIMITATIONS HAVE

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    280 PHYSICAL LIMITATIONS HA\E BEEN

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    282 PHYSICAL LIMITATIONS HAVE BEEN

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    284 PHYSICAL LIMITATIONS HAVE BKKN

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    286 PHYSICAL LIMITATIONS HAVE BEEN

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    288 FORMS OF ENERGY ploitation of h

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    ; 290 FORMS OF ENERGY A Number of I

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    292 FORMS OF ENERGY energy; today i

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    294 FORMS OF ENERGY for nothing." I

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    296 FORMS OF ENERGY 9. What is the

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    298 FORMS OF ENERGY In June, 1939,

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    300 FORMS OF ENERGY every kilowatt-

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    302 FORMS OF ENERGY Research Should

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    ' 304 FORMS OF ENERGY control and u

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    306 FORMS OF ENERGY The wide variet

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    308 FORMS OF ENERGY screw or jack i

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    310 FORMS OF ENERGY He was impresse

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    312 FORMS OF ENERGY The Demand for

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    314 FORMS OF ENERGY cost $400 each,

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    316 FORMS OF ENERGY Milling machine

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    318 FORMS OF ENERGY not otherwise b

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    320 FORMS OF HNKRGY The National Re

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    UNIT V SECTION 4 POWER-DEVELOPING M

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    324 FORMS OF ENERGY From that time

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    326 FORMS OF ENERGY series of crude

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    UNIT V SECTION 5 THE INTERNAL-COMBU

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    330 FORMS OF ENERGY By combining th

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    from 332 FORMS OF ENERGY occurring

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    ' -AA . 334 FORMS OF ENERGY mixes i

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    336 FORMS OF ENERGY fore, have a sy

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    338 FORMS OF ENERGY injeclion syste

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    340 FORMS OF ENERGY Diesel Engines

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    342 FORMS OF ENERGY In 1895 the fir

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    .U4 FORMS OK ENERGY character and p

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    346 FORMS OF ENERGY Filling-station

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    348 FORMS OF ENERGY lates dirt, in

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    350 FORMS OF ENERGY Can some way be

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    UNIT V SECTION 7 THE AIRPLANE IS A

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    354 FORMS OF ENERGY 1913 — At the

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    356 FORMS OF ENERGY of aircraft, th

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    358 FORMS OP^ ENERGY The Developmen

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    360 FORMS OF ENERGY Much more of th

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    , ^/ < < o Q. (/) Z < Ul z *" w f

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    364 FORMS Ol' KNKRG\' 6. What is th

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    366 FORMS OF ENERGY An airplane pro

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    368 FORMS OF ENERGY The drag increa

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    370 FORMS OF ENERGY Fig. 160. The p

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    372 FORMS OF KNERGY Flaps and Slots

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    374 FORMS OF ENERGY lift of the lef

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    376 FORMS OF ENERGY 14. What causes

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    378 FORMS OF ENERGY Celestial navig

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    380 FORMS OF ENERGY above standard

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    382 FORMS OF ENERGY of the bearing

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    384 FORMS OF FNFRGY v^. What aids d

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    UNIT VI LIGHT IS SECTION 1 A FORM O

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    LIGHT IS A FORM OF RADIANT ENERGY 3

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    LIGHT IS A FORM OF RADIANT ENERGY 3

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    LIGHT IS A FORM OF RADIANT ENERGY 3

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    LIGHT IS A FORM OF RADIANT ENERGY 3

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    LIGHT IS A FORM OF RADIANT ENERGY 3

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    LIGHT MAY BE PRODUCED BY LUMINESCEN

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    LIGHT MAY BE PRODUCED BY LUMINESCEN

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    LIGHT MAY BE PRODUCED BY LUMINESCEN

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    LIGHT MAY BE PRODUCED BY LUMINESCEN

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    LIGHT MAY BE PRODUCED BY LUMINESCEN

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    LIGHT MAY BE PRODUCED BY LUMINESCEN

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    UNIT VI SECTION 3 COLORS ARE PORTIO

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    COLORS ARE PORTIONS OF VISIBLE SPEC

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    COLORS ARE PORTIONS OF VISIBLE SPEC

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    COLORS ARE PORTIONS OF VISIBLE SPEC

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    COLORS ARE PORTIONS OF VISIBLE SPEC

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    UNIT VI SECTION 4 THE INVENTION OF

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    POLARIZED LIGHT 423 the crystal is

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    POLARIZED LIGHT 425 arranged at an

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    POLARIZED LIGHT 427 the particle, t

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    POLARIZED LIGHT 429 lent possibilit

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    POLARIZED LIGHT 431 seeing equally

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    LIGHT MAY BE REFLECTED AND REFRACTE

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    LIGHT MAY BE REFLECTED AND REFRACTE

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    LIGHT MAY BE REFLECTED AND REFRACTE

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    LIGHT MAY BE REFLECTED AND REFRACTE

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    LIGHT MAY BE REFLECTED AND REFRACTE

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    ILLUMINATION 443 venient unit of in

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    ILLUMINATION 445 steps out from a w

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    ILLUMINATION 447 12. Why are table

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    SOUND PRODUCED BY VIBRATIONS IN MAT

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    SOUND PRODUCED BY VIBRATIONS IN MAT

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    SOUND PRODUCED BY VIBRATIONS IN MAT

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    SOUND PRODUCED BY VIBRATIONS IN MAT

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    SOUND PRODUCED BY VIBRATIONS IN MAT

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    SOUND PRODUCED BY VIBRATIONS IN MAT

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    ACOUSTICS 461 tuning fork and then

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    ACOUSTICS 463 designed without cons

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    ACOUSTICS 465 These diflferences ar

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    THE SCIENTIFIC BASIS OF MUSIC 467 o

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    THE SCIENTIFIC BASIS OF MUSIC 469 W

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    THE SCIENTIFIC BASIS OF MUSIC 471 I

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    THE SCIENTIFIC BASIS OF MUSIC 473 1

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    UNIT VII SECTION 1 MAGNETISM IS PRO

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    MAGNETISM 479 Magnets Are Surrounde

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    . MAGNETISM 481 with the forces act

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    MAGNETISM 483 8. Explain the magnet

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    STATIC ELECTRICITY 485 as bits of p

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    STATIC ELECTRICITY 487 If the outsi

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    STATIC ELECTRICITY 489 poles, or bu

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    STATIC ELECTRICITY 491 of comblike

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    STATIC ELECTRICITY 495 STUDY QUESTI

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    CURRENT ELECTRICITY 495 Volta Inven

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    CURRENT ELECTRICITY 497 difference

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    CURRENT ELECTRICITY 499 The label o

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    CURRENT ELECTRICITY 501 ance. In su

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    J ELECTROMAGNETISM 503 it could be

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    ; ELECTROMAGNETISM 505 is broken. T

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    ELECTROMAGNETISM 507 of this celebr

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    UNIT VII SECTION 5 ELECTROMAGNETIC

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    ELECTROMAGNETIC INDUCTION 511 This

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    ELECTROMAGNETIC INDUCTION 513 age.

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    ELECTROMAGNETIC INDUCTION 515 Farad

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    ELECTROMAGNETIC INDUCTION 517 so th

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    ELECTROMAGNETIC INDUCTION 519 Alter

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    UNIT VII SECTION 6 ELECTRICAL ENERG

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    ELECTRICITY MAY BE CONVERTED INTO H

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    ELECTRICITY MAY BE CONVERTED INTO H

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    UNIT VII SECTION 7 THE GENERATION A

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    ; RADIO GENERATION AND RECEPTION 52

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    RADIO GENERATION AND RECEPTION 531

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    RADIO GENERATION AND RECEPTION 533

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    RADIO GENERATION AND RECEPTION 535

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    RADIO GENERATION AND RECEPTION 537

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    UNIT VII SECTION 8 THE PHOTOELECTRI

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    THE PHOTOELECTRIC EFFECT 541 from e

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    THE PHOTOELECTRIC EFFECT 543 is nee

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    ELECTRICAL CONDUCTION IN GASES 545

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    ELECTRICAL CONDUCTION IN GASES 547

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    ELECTRICAL CONDUCTION IN GASES 549

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    ELECTRICAL CONDUCTION IN GASES 551

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    UNIT VIII MAN IS MASTERING HIS MATE

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    UNIT VIII SECTION 1 ALL MATTER CONS

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    : THE MATERIALS OF THE UNIVERSE 557

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    THE MATERIALS OF THE UNIVERSE 559 S

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    UNIT VIII THE ATOM IS SECTION 2 THE

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    THE ATOM IS THE UNIT OF CHEMICAL CH

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    THE ATOM IS THE UNIT OF CHEMICAL CH

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    UNIT VIII SECTION 3 ATOMS ARE COMPL

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    ATOMS ARE COMPLEX 569 Discharge-tub

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    ATOMS ARE COMPLEX 571 be determined

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    ATOMS ARE COMPLEX 573 determined by

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    ATOMS ARE COMPLEX 575 mutation expe

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    UNIT VIII SECTION 4 MOLECULES ARE H

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    THE NATURE OF MOLECULES • 579 ©

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    THE NATURE OF MOLECULES 581 orbit t

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    THE NATURE OF MOLECULES 583 Photogr

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    THE NATURE OE MOLECULES 585 values

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    ELECTROVALENT REACTIONS 587 tween c

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    ELECTROVALENT REACTIONS 589 being f

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    I ELECTRON TRANSFER 591 Oxidation-r

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    ELECTRON TRANSFER 593 current of el

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    : : ELECTRON TRANSFER 595 railroad

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    i gain — ELECTRON TRANSFER 597 Ox

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    ELECTRON TRANSFER 599 Magnesium is

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    UNIT VIII SECTION 7 ACIDS ARE PROTO

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    PROTON CHEMISTRY: ACIDS AND BASES 6

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    UNIT VIII SECTION 8 THE TRANSFER OF

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    THE TRANSFER OF PROTONS 607 be dete

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    THE TRANSFER OF PROTONS 609 A deter

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    H H H H H H H H COVALENT REACTIONS

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    COVALENT REACTIONS 613 enter into.

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    C H H COVALENT REACTIONS 615 H H H

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    I I I H H I I I H H I I I COVALENT

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    COVALENT REACTIONS 619

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    UNIT IX CREATIVE CHEMISTRY HAS CONT

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    624 CREATIVE CHEMISTRY The use of o

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    626 CREATIVE CHEMISTRY to sulfur tr

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    628 C'RKATIVK CHKMISTRV " Life Woul

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    630 CREATIVE CHEMISTRY Silicon carb

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    632 CREATIVE CHEMISTRY A gel is for

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    UNIT IX SECTION 2 METALLURGICAL PRO

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    : 636 CREATIVE CHEMISTRY impurities

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    638 CREATIVE CHEMISTRY electrons an

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    640 CREATIVE CHEMISTRY Iron is some

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    642 CREATIVE CHEMISTRY metals, prod

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    UNIT IX SECTION 3 COMBUSTION FURNIS

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    646 CREATIVE CHEMISTRY Not All Subs

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    648 CREATIVE CHEMISTRY ammonium pho

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    650 CREATIVE CHEMISTRY The vaporizi

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    : 652 CREATIVE CHEMISTRY Portland c

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    654 crp:ative chemistry 10. What co

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    656 CREATIVE CHEMISTRY The role whi

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    658 CREATIVE CHEMISTRY The nitrogen

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    660 CREATIVE CHEMISTRY NO2, which r

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    662 CREATIVE CHEMISTRY Ammonia is f

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    UNIT IX SECTION 5 CELLULOSE IS THE

  • Page 684 and 685:

    666 CREATIVE CHEMISTRY duce a mater

  • Page 686 and 687:

    668 ( RKATIVK (^HEMISTRY and other

  • Page 688 and 689:

    670 CREATIVE CHEMISTRY All pyroxyli

  • Page 690 and 691:

    672 CREATIVE CHEMISTRY 8. ShrinkpTO

  • Page 692 and 693:

    UNIT IX SECTION 6 SYNTHETIC PLASTIC

  • Page 694 and 695:

    676 CREATIVE CHEMISTRY asbestos, or

  • Page 696 and 697:

    678 CREATIVE CHEMISTRY Moldings of

  • Page 698 and 699:

    ' i H i 680 CREATIVE CHEMISTRY comp

  • Page 700 and 701:

    682 CREATIVE CHEMISTRY Fig. 297. A

  • Page 702 and 703:

    N I 684 CREATIVE CHEMISTRY for use

  • Page 704 and 705:

    686 CREATIVE CHEMISTRY mable, and t

  • Page 706 and 707:

    UNIT IX SECTION 7 COAL HAS BECOME A

  • Page 708 and 709:

    ' Mustard Gas COOCH3 \y t Methyl sa

  • Page 710 and 711:

    " 692 CRKATIVK CHKMISTRY these dyes

  • Page 712 and 713:

    694 CREATIVE CHEMISTRY coal) with s

  • Page 714 and 715:

    696 CREATIVE CHEMISTRY restricted i

  • Page 716 and 717:

    698 CREATIVE CHEMISTRY ethyl lead w

  • Page 718 and 719:

    700 CREATIVE CHEMISTRY Large-scale

  • Page 720 and 721:

    702 CREATIVE CHEMISTRY In addition

  • Page 722 and 723:

    704 CREATIVE CHEMISTRY 6. What are

  • Page 724 and 725:

    : 706 CREATIVE CHEMISTRY makes it p

  • Page 726 and 727:

    708 CREATIVE CHEMISTRY In 1895 the

  • Page 728 and 729:

    H 710 CREATIVE CHEMISTRY need not b

  • Page 730 and 731:

    712 CREATIVE CHEMISTRY Another new

  • Page 732 and 733:

    714 CREATIVE CHEMISTRY price of nat

  • Page 735:

    : UNIT X MAN'S PHYSICAL WELFARE IS

  • Page 738 and 739:

    ' 720 MAN'S PHYSICAL WELFARE and in

  • Page 740 and 741:

    722 MAN'S PHYSICAL WELFARE Sugars a

  • Page 742 and 743:

    724 MAN'S PHYSICAL WELFARE Coal, Oi

  • Page 744 and 745:

    726 MAN'S PHYSICAL WELFARE becomes

  • Page 746 and 747:

    728 MAN'S PHYSICAL WELFARE There Ar

  • Page 748 and 749:

    730 MAN'S PHYSICAL WELFARE Plants R

  • Page 750 and 751:

    732 MAN'S PHYSICAL WELFARE elements

  • Page 752 and 753:

    734 MAN'S PHYSICAL WELFARE the Chil

  • Page 754 and 755:

    736 MAN'S PHYSICAL WELFARE Proteins

  • Page 756 and 757:

    UNIT X SECTION 3 VITAMINS, ENZYMES,

  • Page 758 and 759:

    740 MAN'S PHYSICAL WELFARE Vitamin

  • Page 760 and 761:

    742 MAN'S PHYSICAL WKLFARE Dietary

  • Page 762 and 763:

    744 MAN'S PHYSICAL WELFARE

  • Page 764 and 765:

    746 MAN'S PHYSICAL WELFARE Periodic

  • Page 766 and 767:

    748 MAN'S PHYSICAL WELFARE Ethylene

  • Page 768 and 769:

    UNIT X SECTION 4 LARGE-SCALE CHEMIC

  • Page 770 and 771:

    752 MAN'S PHYSICAL WELFARE Insects

  • Page 772 and 773:

    754 MAN'S PHYSICAL WELFARE Over thr

  • Page 774 and 775:

    UNIT X SECTION 5 THE UTILIZATION OF

  • Page 776 and 777:

    758 MAN'S PHYSICAL WELFARE ashes wi

  • Page 778 and 779:

    760 MAN'S PHYSICAL WELFARE Detergen

  • Page 780 and 781:

    : 762 MAN'S PHYSICAL WELFARE floor

  • Page 782 and 783:

    764 MAN'S PHYSICAL WELFARE From the

  • Page 784 and 785:

    766 MAN'S PHYSICAL WELFARE 5. What

  • Page 786 and 787:

    768 MAN'S PHYSICAL WELFARE used wit

  • Page 788 and 789:

    C I H C I H 770 MAN'S PHYSICAL WELF

  • Page 790 and 791:

    C I . C I H C I H 772 MAN'S PHYSICA

  • Page 792 and 793:

    C C C C 774 MAN'S PHYSICAL WELFARE

  • Page 794 and 795:

    776 MAN*S PHYSICAL WELFARE Still an

  • Page 796 and 797:

    •78 MAN'S PHYSICAL WELFARE by his

  • Page 798 and 799:

    C C H C\ C— I CH H 1 I I H C C I

  • Page 800 and 801:

    I I I I I I H I I 782 MAN'S PHYSICA

  • Page 802 and 803:

    C I H C H C H 784 MAN'S PHYSICAL WE

  • Page 804 and 805:

    786 MAN'S PHYSICAL WELFARE composit

  • Page 806 and 807:

    788 MAN'S PHYSICAL WELFARE Ephedrin

  • Page 808 and 809:

    UNIT X SECTION 8 PROTOPLASMIC AND C

  • Page 810 and 811:

    792 MAN'S PHYSICAL WELFARE waste pr

  • Page 812 and 813:

    794 MAN'S PHYSICAL WELFARE ested in

  • Page 814 and 815:

    UNIT X SECTION 9 THE PROGRESS OF CI

  • Page 816 and 817:

    798 MAN'S PHYSICAL WELFARE it is up

  • Page 818 and 819:

    800 MAN'S PHYSICAL WELFARE Accordin

  • Page 820 and 821:

    CONCLUSION You have just completed

  • Page 822 and 823:

    804 CONCLUSION or the everyday prob

  • Page 824 and 825:

    806 BIBLIOGRAPHY Author Thouless, R

  • Page 826 and 827:

    808 BIBLIOGRAPHY Author

  • Page 828 and 829:

    810 BIBLIOGRAPHY Author

  • Page 830 and 831:

    812 BIBLIOGRAPHY Author Henney, K.

  • Page 832 and 833:

    814 BIBLIOGRAPHY Author

  • Page 834 and 835:

    816 IMBLlOCRAl'in' Author Smith, K.

  • Page 836 and 837:

    818 INDEX Automobile {continued) de

  • Page 838 and 839:

    820 INDKX Conductor, 487 Conglomera

  • Page 840 and 841:

    822 INDEX Faraday's laws, 569, 587

  • Page 842 and 843:

    824 INDEX Isomerism positional, 618

  • Page 844 and 845:

    826 INDEX Music, 466-473 Musical in

  • Page 846 and 847:

    828 INDEX Proton (continued) activi

  • Page 848 and 849:

    830 INDEX Star {continued) Sirius,

  • Page 850:

    832 Wind instruments, 470-471 Windm

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