W. T. Sedgwick (1855-still living), head of the Department 
of Biology and Public Health at the Massachusetts Institute of 
Technology, has devoted his training and energy largely to 
making cities healthful. He is one of the foremost American 
biologists in making investigations upon milk, water, sewage, 
and epidemics of typhoid fever, and in showing how to apply 
these technical studies to human welfare. 
He was one of the first to study the bacteria of the air, and 
his work on the “ Principles of Sanitary Science and Public 
Health” (1902) was an important contribution to public health 
education. In addition to this marked service to his countrymen, 
he has devoted his life to teaching biology and sanitary science 
and to training biologists and public health workers. 
One renders a great service to his age who leaves the world 
safer to live in than he found it. 
