MASTIGOPHORA 409 



always associated with a general enlargement of the lymph nodes. 

 The trypanosomes are numerous in the blood during the febrile 

 period and become very scarce during the intermissions. The 

 fever leads to emaciation and death, sometimes without inducing 

 the terminal coma and sometimes with the production of typical 

 sleeping' sickness. The sleeping sickness is characterized by pro- 

 longed coma and progressive emaciation. At intervals the 

 patient may be aroused and given nourishment, but eventually 

 this is no longer possible. At this stage the trypanosomes are 

 present in the cerebrospinal fluid. Bacterial infection of the 



Fig. 166. — Trypanosoma avium in the blood of common wild birds. X isoo. 

 (After Novy and, MacNeal.) 



meninges often takes place as a terminal event. It is conserva- 

 tively estimated that roo,ooo natives have died of trypanosomiasis 

 ■in Africa from 1900 to 19 10. There have been several cases in 

 Europeans. Recovery seems to be rather uncommon but does 

 occur. 



Trypanosoma Rhodesiense.- — Stephens and Fantham^ have 

 studied a case of human trypanosomiasis contracted in north- 

 eastern Rhodesia, where Glossma palpalis does not occur. The 

 parasite differs somewhat from Tr. gambiense and is regarded by 



' ^ Proc. Royal See, 1910, Ser, B, Vol. LXXXIII, pp. 28-33. 



