suggests the joy of being well. But the ultimate realization of one's aims and ambitions in life and the actual prolongation of one's period of usefulness are higher and more enduring rewards.
Exercises.—1. Summarize the different laws of hygiene. Upon what one fundamental law are these based?
2. State the important differences between a condition of health and one of disease.
3. In what general ways may disease originate in the body?
4. Describe a model sanitary home. With what special hygienic problems has the housekeeper to deal?
5. Describe a method of collecting a wholesome supply of cistern water. State possible objections to well and spring water.
6. What means may be employed in preventing the spread of contagious diseases?
7. By what means are malaria, typhoid fever, diphtheria, and tuberculosis spread from one individual to another?
8. Why are extra precautions necessary in the recovery from certain diseases, as typhoid fever, diphtheria, and scarlet fever?
9. How may one's vocation become a cause of disease? What conditions in the life of a student may, if uncounteracted, lead to poor health?