REFERENCES
Report on National Vitality. Committee of One Hundred. (Fisher.)
The Nature of Man. Metchnikoff.
The Prolongation of Life. Metchnikoff.
The New Hygiene. Metchnikoff.
Vital Statistics. Farr.
The Kingdom of Man. Lankester.
Cost of Tuberculosis. Fisher.
School Hygiene. Keating.
Economic Loss Through Insects That Carry Disease. Howard.
Report of Associated Fraternities on Infectious, Contagious, and Hereditary Diseases.
Conservation of Life and Health by Improved Water Supply. Kober.
Backward Children in the Public Schools. Davis.
Dangers to Mine Workers. (Mitchell.) Report Governor's Conference.
Tuberculosis in the U. S. Census Report 1908.
Industrial Accidents. Bureau of Labor Pamphlet, 1906.
Factory Sanitation and Labor Protection. Dept. of Labor, No. 44.
How Insects Affect Health in Rural Districts. Dept. of Agriculture. Bulletin 155.
Public Health and Water Pollution. Bulletin 93.