PLATE 1G. 



Pigs. 19-20 from the spleen. 



Pigs. 21-36 from the peripheral circulation. 



Pig. 19. — Cyst showing the kinetonucleus tying in the neighborhood of 

 t he i rophonneleus. 



Pig. 20. — Commencement of the development of the cyst. 



Pig. -J].— Further growth of the flagellum and the passage backward 

 of the kinetonueleus. 



Pigs. L'ii-24. — Various stages in tl longation of the trypanosome, 



resulting in the formation of a small indifferent form. 



Pigs. 25-28. — Division of small, immature, trypanosomes. 



Pigs. 29-34. — Successive stages in the differentiation of the female 

 form from the indifferent type of trypanosome. 



Pig. 29. — Division of the intranuclear centrosome together with slight 

 precipitation of chromatin around the anterior daughter centrosome. 



Pigs. 30-31.— Budding-off of a portion of the trophonucleus, togethei 

 with the anterior daughter eentrosome. 



Pig. 31. — Trypanosome showing the passage of this budded-off chro 

 matin to the anterior extremity. 



Figs. 33-34. — Fully developed female forms showing large nuclei, short 

 Bagella and dense protoplasm. 



Pigs. 35-36. — Stages in the degeneration of the female forms. 



[142] 



