522 



Sleeping Sickness 



some forms of the parasite appear in the blood in about a week, 

 then may disappear. The animals live a month or two. 

 Diagnosis. As the trypanosomes are present in the circulating 



, : 



Fig. 214. Schizotrypanum cruzi developing in the tissues of the guinea-pig. 

 i. Cross-section of a striated muscle fiber containing Schizotrypanum cruzi: Note 

 dividing forms. 2. Section of brain showing a Schizotrypanum cyst within a 

 neuroglia cell, containing chiefly flagellated forms. 3. Section through the supra- 

 renal capsule, fascicular zone. 4. Section of brain showing a neuroglia cell filled 

 with round forms of Schizotrypanum. (From Low, in Sleeping Sickness Bulletin, 

 after Vianna.) 





blood of human beings in somewhat small numbers, and only at 

 certain times, it is unwise to rely upon them as a means of making 



