amount of nutrients consumed? 730. Why do people of sedentary habits
require a different dietary from those pursuing active, out-of-door
occupations?

CHAPTER XVIII

RATIONAL FEEDING OF MAN

731. What is the object of the rational feeding of man? 732. On what is
it based? 733. How does it compare with the rational feeding of animals?
734. What is a standard ration? 735. How is it determined? 736. To what
extent may the nutrients of a ration vary from the standard? 737. How do
you combine foods to form a balanced ration? 738. What foods are
valuable for supplying protein? 739. What foods supply fats? 740. What
foods are rich in carbohydrates? 741. What other requisites should a
ration have in addition to supplying the necessary nutrients? 742. Why
is it necessary to consider the calorie value of a ration? 743. If a
ration contained an excess of carbohydrates and a scant amount of
protein, how could it be improved? 744. How do you calculate the
nutrients in a fraction of a pound of food? 745. Give the amounts of the
common food materials, as potatoes, bread, butter, milk, and cheese,
ordinarily combined to form a ration. 746. To what extent may foods
differ in composition from the average analysis given? 747. What foods
are subject to the greatest and what foods to the least variation?

CHAPTER XIX

WATER

748. Why is water regarded as a food? 749. Does it enter chemically into
the composition of plants? Of animals? 750. In addition to serving as a
food, why is water necessary for life processes? 751. In what ways may
water be improved? 752. What are the most common forms of impurities?
753. What are the mineral impurities of water? 754. What is their
source? 755. What effect do some of these minerals have upon the value
of the water? 756. What causes some waters to dissolve limestone? 757.
What are permanently hard waters? 758. To what is temporary hardness in
water due? 759. What is the best way to remove mineral matter from
water? 760. What are the organic impurities of water? 761. What are the
sources of the organic impurities? 762. What change does the organic
matter of water undergo? 763. What becomes of the nitrogen of the
organic matter? 764. What does the presence of nitrates in water
indicate? Nitrites? 765. What is the total solid matter of a water, and
how is it obtained? 766. Define the terms free ammonia; albuminoid
ammonia. 767. What does the presence of chlorine in a surface well water
indica