80 PUBLIC HEALTH 



petrel, gannet, puffin, kittiwake gull, commoD murre and Brunnich's 

 inline. (Reproduced from Btudiesal Bird Rock, Gulf of St. Lawrence.) 

 Thia was the American Mux-inn'- first habitat group. 



Return to the South Pavilion containing (hi apes and monh 



W'j.-I < "OKRIDOR 



PUBLIC HEALTH 



Returning to the South Pavilion where the monkeys are, and passing 



to the right, we enter the W< -t Corridor containing the exhibits of the 

 Department of Public Health. 



The Hall of Public Health is dominated by a bronze bust of Louis 

 Pasteur, the founder of scientific bacteriology and preventive medicine, 

 which was presented to the Museum through the courtesy of the Pasteur 

 Institute of Paris. Near the head of the stairway i- a reading table 

 where pamphlets bearing on insect-borne disease and other public- 

 health problems may be consulted. 



The first section of the exhibit deals with the natural history of water 



supply as it affects the life and health of man. The large frieze at the 



„ r . „ , entrance to the corridor on the left illustrates the primary 

 Water Supply l - 



source of water supply, the sea, the clouds, and the 

 secondary sources, rivers and lakes. Diagrams, models and a relief 

 map show the variations in rainfall at different points in the United 

 States. Relief maps of the region about Clinton, Massachusetts, before 

 and after the construction of the Wachusett Reservoir for the water 

 supply of Boston, show the way in which surface water supplies are 

 collected by impounding streams, and, further on, a model of a well 

 sunk through impervious clay or rock down to w^ater-bearing strata shows 

 how groundwater supplies are obtained. Samples and models illustrate 

 the variations in composition which occur in natural waters, from the 

 swamps of Virginia to the deep wells of Iowa and the turbid rivers 

 of the Ohio Valley. 



Some of the principal micro-organisms. Alga? and Protozoa, which 

 grow in reservoirs and impart tastes and odors to water are represented 

 by a series of glass models. The effect produced by the pollution of 

 water by disease germs is illustrated by relief maps and diagrams show r - 

 ing the course of famous typhoid and cholera epidemics. Models are 

 displayed which illustrate the purification of water by storage, filtra- 

 tion and disinfection, the filter models being elaborate representations 

 of the plants at Little Falls, X. J., and Albany, X. Y. Diagrams indicate 

 the results of water purification as measured in the saving of human life. 



