Man's physical universe

xanabras

FOODS 737

regardless of whether the diet is deficient or overinsured in minerals.

Under average conditions a man excretes from twenty to thirty grams

of minerals per day.

The Frequent Lack of Minerals in the American Dietary Is the Result

of Modem Food Habits.

Some foods are naturally richer in

minerals than are other foods.

Natural foods are often robbed of their minerals by refining processes

such as the bolting of wheat, the polishing of rice, the refining of sugar

in factories, or the peeling, and boiling of foods in water in the home.

Some people are allergic to such foods as milk, eggs, or meat, which

are good sources of certain

minerals, while other people have established

appetites for foods which are deficient in minerals.

STUDY QUESTIONS

1. What is the Tyndall effect? Give a number of common examples.

2. What is the outstanding property of colloids? Explain why colloids exhibit

this property.

Give an application of this property.

3. Why do colloidal particles remain in suspension?

4. Why is the study of colloids important?

5. What is the source of the electrical charge on colloidal particles?

6. Explain the formation of deltas.

7. Why do colloidal particles show so much adsorption?

8. Compare the size of colloidal particles with that of molecules.

9. List the different types of colloids with two examples of each.

10. What are the two general methods for the preparation of colloids?

11. Give the principle of the Cottrell smoke-precipitation process.

12. Mention three practical applications of adsorption.

13. Differentiate between adsorption and absorption.

14. Present evidence that plants require certain minerals for proper growth.

15. What minerals are required by plants? Which of these minerals are frequently

deficient in the soil and why? What are the sources of minerals in

fertilizers?

16. What is meant by "hydroponics"?

17. What processes liberate minerals in the soil?

18. Why is chemical analysis of the soil important in agriculture?

19. How can one determine what fertilizer and how much of it is required for a

given soil?

20. Do plant products always contain the same amounts of minerals? Why or

why not?

21. List the foods required by animals and state the function of each.

22. What are the main dietary problems of the American people?

23. Which minerals are frequently deficient in the American dietary, and why

are they deficient?

24. Why may it be said that "A man can be what he chews to be"?

25. Explain what happens to the excess quantities of each of the types of food

constituents when they are contained in the dietary.

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