18 Sir D. Bruce and Capts. Hamerton and Bateman. [Sept. 18, 



For purposes of comparison measurements of Trypanosoma dimorphon and 

 Trypanosoma congolense are given in the following tables : — 



No. of experiment. 



Day of 

 disease. 



Method of 

 staining. 



Average 

 length. 



In microns. 



Maximum 

 length. 



Minimum 

 length. 



Mouse (Laveran and 

 Mesnil) 



116, rat (Breinl) 



>» )) 



Dog (Harvey, Sierra 



Leone) 

 Cow (Smith, Sierra 



Leone) 



142, mouse 



143, mouse 

 152, rat ... 



,, 



154, rat ... 



15 

 9 

 9 

 9 



7 

 5 

 11 

 11 

 19 



Trypanosoma dimmphon. 

 Griemsa ... 



Leishman 



Average 



Griemsa ... 

 Leishman 

 Griemsa ... 



Average 



13 -8 



17 -0 



12 -0 



13 -8 



16 



11 -o 



11 -3 



14 -0 



9-0 



12 -6 



15 -0 



11 -o 



12 3 



15 -0 



9-0 



12 -4 



15 -0 



10 -o 



12 -5 



15 -3 



10 -3 



golense. 







12 -8 



15 -0 



10 -o 



11 -5 



14 -0 



10 -o 



11 -6 



15 -0 



9-0 



11-5 



14 -0 



10 -o 



12 -6 



17-0 



10 



12 -0 



15-0 



9 -8 



Breadth. — On an average the breadth at the widest part is 3 microns. 



Shape. — Dr. Edington's trypanosome when stained is seen to be of a short 

 and stumpy shape, somewhat reminding one of a miniature electric eel. 

 The posterior extremity is, as a rule, blunt, or rounded or obtuse-angled, but 

 sometimes, though rarely, it is prolonged into a sharp beak-like process. 

 The anterior end tapers more or less, and ends in a short stout flagellum. 

 The undulating membrane is narrow but distinct. The flagellum arises at or 

 near the micro-nucleus and passes along the edge of the undulating 

 membrane. There is no free flagellum, the protoplasm of the cell and the 

 undulating membrane extending as far as the tip of the flagellum. 



Contents of Cell. — The protoplasm, which is stained a pale puce colour, is 

 homogeneous in structure. 



Nucleus. — The nucleus is oval in shape, about 2 - 5 microns in length, and is 

 situated at the centre of the trypanosome. 



Micro-nucleus. — The micro-nucleus, centrosome, or kineto-nucleus, is small, 



