G62 



TRYPANOSOMIASIS 



a fourth of the whole length, but occasionally the body proto- 

 plasm extends quite to the anterior end of the organism. The 

 undulating membrane is narrow, and the posterior end may be 

 either sharp or blunt. The trypanosome contains the macro- and 

 micro-nucleus characteristic of the group, and the protoplasm 

 often shows chromatin granules. It does not usually long survive 

 removal from the body, but it has been found to be motile for 

 nineteen days when kept on rabbit-blood agar at 22° C. As we 



, \ 



V .■' 



Pig. 197. — Trypanosoma g&mbiense from blood of guinea-pig. x 1000 

 See also Plate VI., Fig. 25. 



have said, when Tr. ugandense is inoculated in monkeys they 

 often contract an illness which ultimately presents the features 

 of typical sleeping sickness. In inoculation of other species of 

 animals, e.g., herbivora, the guinea-pig, in nearly every case a 

 proliferation of the parasite, as indicated by its appearing in the 

 blood, takes place ; but often either no disease occurs or this runs 

 a very chronic course. 



By means of microscopic examination the organisms may be 

 found in the cerebro-spinal fluid, the blood, or the juice of 



