DISEASES CAUSED BY PROTOZOA. 



113 



into the bowel. The material to be examined must be 

 kept warm in order to preserve the motility of the 

 amebae. 



The disease is of long duration and no specific 

 method of treatment is known. The drug emetin has 

 been used much of late, with success. 



Fig. 15. Ameba coli. From dysenteric stool. (Zeiss Apochr., 

 1 ; oil immersion, H2-) (After Losch.) 



SYPHILIS. 



The Treponema pallidum- is the infectious agent 

 causing syphilis. It was discovered in 1905. It is a 

 very delicate spiral with from 3 to 12 turns and with 

 pointed ends. The cultivation of the organism was 

 not successful until 1911, when Dr. Noguchi, at the 

 Rockefeller Institute in New York, found that they 



