THR H^MOFLAGELLATES. 



163 



referred to under distinct names, renders it sometimes qnite difficult to 

 follow liim correctly. The thoughtful character of his work, however, is 

 well illustrated by the following passage talcen from the " Parasitologic com- 

 parce du sang des oiseaux" (18). The author draws attention to the analogy 

 between the spirilliform flagella of " Polymitus " (i. e. the male gametes of 

 a malarial parasite) and the SpirochiBta obermeieri found in the blood 

 in relapsing fevers, and goes on — " Oue may very likely suppose that S. 

 obermeieri also is, by origin, not a free Bacterial form, but in all proba- 

 bility represents only a stage [in the life history] of a Ha3matozoan, more 



Fig. 3. — a — c. Different forms of "Trypanosoma san- 

 guinis avium," Danilewsky; d, the same parasite dividing 

 longitudinally, n ■=■ nucleus; u. m. =: undulating membrane ; 

 /. = llagellum. (After Danilewsky.) 



complex than is yet known, which at some period may even be intracellular (a 

 Hiemocytozoon). Altliough this surmise has not been verified (so far) for 

 that particular organism, it has been proved for one very Spirochseta-like 

 parasite (T. ziemanni), and it seems by no means unlikely that it will be 

 found to be true in the case of certain others also (cf. Appendix). It 

 shows, at any rate, that Danilewsky was fully alive to the manifold 

 possibilities in connection witli these organisms. 



The discovery by Bruce, in 1894, of the South African parasite 

 (Trypanosoma briicii) in tlie blood of cattle and horses suffering 

 from Nagana may be said to have inaugurated a rapid and consider- 

 able increase in the number of known forms, the knowledge of which has 



