160 Pathogenic Agent in a Case of Human Trypanosomiasis. 



trypanosome in question is not T. gambiense. On the other hand this 

 trypanosome resembles very closely T. rhodesiense, and is probably identical 

 with it. 



The disease was contracted in a district (Dowa sub-district of Angoniland), 

 where Glossina palpalis has never been found, but where Glossina morsitans 

 is known to exist in large numbers. It appears probable, therefore, that 

 this trypanosome (T. rhodesiense) is a distinct species which is capable of 

 transmission by some other agent than Glossina palpalis, probably Glossina 

 morsitans. 



EXPLANATION OF PLATE 2. 



Drawn with Abbe camera lucida, using 2 mm. apochromatic objective and No. 18 

 compensating ocular (Zeiss). Magnification 2150 diameters. 

 Figures [.drawn from parasites in the blood of the monkey except when otherwise stated. 

 Figs. 1 — 4. — Forms with the nucleus median. Figs. 1 and 2 show line connecting 

 blepharoplast with nucleus ; in figs. 3 and 4 marked vacuolation of cytoplasm 

 is seen. 



Figs. 5 — 12. — Forms in which the nucleus is seen to become gradually more posterior 

 until it lies on a level with the centrosome (fig. 5 from patient's blood, fig. 8 

 from rabbit's blood). 



Fig. 13. — Division form with nucleus median (from patient's blood). 



Figs. 14 — 17. — Division forms with one or both nuclei posterior (figs. 16 and 17 from 

 patient's blood). 



