182 



THE KINGDOM OF MAN 



It is now shown by Schaudinn that the blood-parasite spiro- 

 chaeta is a phase of a trypanosome (fig. 54) ; that it has a 

 large nucleus and a micronucleus or blepharoplast, neither 

 of which are present in the spiral Bacteria ; and, further, 

 that it alters its shape, contracting so as to present the 

 form of minute oval or pear-shaped bodies, each provided 

 with a larger and a smaller nucleus (fig. 54, E, F). These 

 oval bodies are often engulfed by the colourless corpuscle 



A. 



FIG. 55. 



Trypanosoma Ziemanni, from the blood of the little owl. The stages 

 shown in Figs. 52 54 are passed inside the gnat. The spiral and pear- 

 shaped bodies of Fig. 54 pass from the gnat's proboscis into the blood of 

 the little owl, and grow there into the large forms here figured. A, B, 

 and C are females, destined to be fertilized by spermatozoa (see Fig. 21) 

 when swallowed by a gnat. D and E are male Tr} panosomes, which will 

 give rise each to eight fertilizing individuals or spermatozoa as shown 

 in Fig. 56 when swallowed by a gnat. 



(phagocytes) of the blood ; and it is in the highest degree 

 probable that in this condition they have been observed in 

 some tropical diseases without their relation to the spiral 

 forms being suspected. The corpuscles lately described 



