118 On Nag ana, or Tsetse Fly Disease. 



Exposure for several hours in an atmosphere of hydrogen or CO 2 has 

 no appreciable effect on the motility of hsematozoa in blood-free serous 

 fluids. The haamatozoa are also fully active in hosts killed by ether, 

 chloroform, or coal-gas. 



7. Oval forms, smaller than the ordinary hsematozoa, with (or without) 

 a short flagellum, and often with a " beak " at the opposite pole, have 

 been observed in the organs, but rarely in circulating blood. 



8. Small rounded or ovoid bodies, about 1 2 ja in diameter, hyaline, 

 sometimes with a refringent chromatin spot or bipolar spots, or irre- 

 gular (? ameeba-like) bodies, also sometimes with a chromatin spot and 

 of the same size or rather larger, have been observed, especially in the 

 lymphatic glands and bone-marrow, or spleen. It is possible that these 

 are early stages in the development of the haematozoon. No forms 

 have been seen at any time within the red blood corpuscles. 



9. Neither sporocystic nor larger distinctly amoeboid forms have 

 been observed. 



As our observations on the development of the parasites are still in 

 an incomplete condition, this short statement must suffice, and a more 

 detailed description must be left for a future occasion, when we submit 

 a full report upon our work. 



