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THE POPULAR SCIENCE MONTHLY 



with this disease have been admitted to the Marine Hospital at Sa- 

 vannah for special observation and study. Similarly patients have been 

 admitted to the Wilmington, N. C, Marine Hospital for the study of 

 hookworm infection. Two laboratory officers were detailed with the 

 mine rescue car of the Bureau of Mines to investigate hookworm disease 

 among miners in southern states and lung diseases among Colorado 

 miners, and also to report on the general sanitation and hygiene of 

 mines. 



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Service Quarters, Marivales Quarantine, Philippine Islands. 



The San Francisco plague laboratory has continued its work of 

 examining rodents for the germs of bubonic plague. It has also made 

 studies on the penetrating power of various gases used in disinfecting 

 ships, on rat leprosy and on the role of fleas in transmitting the plague. 

 At the Leprosy Investigation Station in Hawaii, the bacillus of leprosy 

 has been successfully grown on artificial media. Monkeys have been 

 inoculated with leprosy from human beings, and thus the way has 

 been opened for the development of a curative or preventive serum. 

 Special studies have also been made by service officers on such subjects 

 as the sanitary disposal of night soil ; the growth of animal tissues out- 

 side the body; the role of oysters in the propagation of typhoid fever; 

 the longevity of the typhoid bacillus on vegetables ; and the influence of 

 poisonous gases on health. 



During the summer of 1912, plague broke out in Porto Rico and 

 Passed Assistant R. H. Creel was detailed to direct the work of control 



