10. Of what special value are the parks and pleasure grounds in a city to the health of its inhabitants?
11. Discuss the hygienic value of work.
12. What conditions lead to the continuance of habit-forming substances after their use has become general?
13. How is it possible for one not using alcohol to be injured by this substance?
14. Discuss the effect of alcoholic abuse upon social environment.
15. Summarize the rewards of hygienic living.
SUMMARY OF PART II
For the maintenance of life the needs of the cells must be supplied and the body as a whole must be brought into proper relations with its surroundings. The last-named condition requires that the body be moved from place to place; that its parts be controlled and coördinated; and that it be adjusted in its various activities to external physical conditions. To accomplish these results there are employed:
1. The skeleton, or bony framework, which preserves the form of the body and supplies a number of mechanical devices, or machines, for causing a variety of special movements.