60 



PEACTICAL PABASITOLOGY 



Kat-lice, the undoubted carriers of T. lewisi, may, on account of 

 their flat form and their transparency, be examined for Trypanosomes 

 under the microscope without preparation. The Trypanosomes may 

 be exposed by isolating the intestinal canal with two fine pins, and 

 then teasing it out in a little normal saline solution. 



(b) Hcemoproteus. 



A peculiar form of parasite is found in the blood of certain birds, 

 especially singing birds, and of the carnivori. It feeds upon the red 

 blood corpuscles, and may be either sickle-, dumb-bell-, or bean- 

 shaped. The full-grown parasite is so placed in the long diameter 

 of the red blood corpuscle that it encloses the nucleus with its con- 

 cave side (fig. 16, f) without, however, as a rule, displacing it. These 



FIG. 16. Diagrammatic representation of the changes of the asexual forms of Hcemo- 

 proteus noctuce (Celli and Sanfelice) in the blood of the owl. (After Schaudinn, from Braun.) 

 a, Penetration into a red blood corpuscle, b, Resting stage, c, Resting stage forty-eight 

 hours later, d, Leaving the red blood cell ; commencing formation of flagellum. 

 e, Trypanosome form, resulting from d, beginning to penetrate a red blood corpuscle. 

 /, Resting stage, five days after a. g, Full-grown Trypanosome. 



organisms are termed Hcemoproteus and their significance is twofold. 

 In the first place, it is quite certain that the process of fertilization in 

 Hcemoproteus is identical with that of the other Plasmodia (malaria 

 parasite of man and Proteosoma), while it may be observed under the 

 microscope with far greater accuracy and ease. In the second place, 

 observations of a variety of Hcemoproteus found in the common brown 

 owl (Athene noctua), have established the fact that these non-flagellate 



