THE AMERICAN MUSEUM OF NATURAL HISTORY 



of water supply, its contamination and pollution, storage, 

 filtration, disinfection and purification. 



A series of five large relief maps shows the development 

 of the water supply of New York City. 



Following are models and charts illustrating the improper 

 disposal of sewage and how it can be avoided, the polluted 

 waters of New York Harbor commonly used as bathing 

 places and shellfish beds; models of the latest and most 

 approved types of sedimentation tanks, filter beds and 

 screens are included. 



The shapes and relative sizes of many forms of bacteria 

 are illustrated, and window transparencies show how the 

 more important bacterial forms appear under the micro- 

 scope. 



The ravages of the "Black Death," or bubonic plague, are 

 well illustrated, with habitat groups of the rats and ground 

 squirrels which serve as intermediate hosts for its microbes. 



The mosquito, the carrier of malaria and yellow fever, 

 has its section, as well as such other disease carriers as the 

 tick and bedbug, and the Glossina, which transmits sleep- 

 ing sickness. 



Exhibits are also installed illustrating military hygiene 

 and sanitation and the rations of troops in the field. 



The exhibit is a portion of a comprehensively planned 

 Hall of Public Health which ultimately will cover a much 

 wider field. The exhibits now installed cover with reason- 

 able completeness the topics of water supply, sewage dis- 

 posal and insect-borne disease. 



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