1913.] Diseases of Domestic Animals in Nyasaland. 281 



This curve is made up of measurements from 20 specimens of trypano- 

 somes taken from the waterbuck, 40 from the ox, 260 from the goat, and 

 180 from the sheep. 



From it will be seen that T. caprce is a monomorphic species, varying from 

 18 to 32 microns in length, the greatest number of individuals (19 per cent.) 

 being 25 microns long. 



Breadth. — Measured across the broadest part T. caprce averages 3 microns 

 in breadth (maximum 4"25, minimum 1*75). 



Shape. — T. caprce differs from T. vivax in that it is heavier built and 

 altogether has a larger and clumsier appearance. The posterior half is 

 swollen, and its end is bluntly angular or rounded. The anterior extremity 

 is narrower and pointed (Plate 5). 



Contents of Cell. — Clear, with a delicate alveolar structure, and free from 

 vacuoles or granules. 



Nucleus. — Oval, compact, lying about the middle of the body. 



Micronuclcus. — Large and round, situated, as a rule, close to the posterior 

 extremity, but sometimes removed to a short distance. 



Undulating membrane. — Much more developed than in T. vivax, and thrown 

 into bolder folds and undulations. 



Flagellum.—- -There is a well-marked free flagellum which averages 

 6 - 5 microns in length (maximum 9*5, minimum 4). No specimens have been 

 seen without a free flagellum as stated by Kleine. 



Disease set up in Cattle by T. caprce. — Only two oxen were inoculated from 

 goats suffering from this disease. These animals showed the trypanosomes 

 in their blood in small numbers for two months after inoculation. The 

 trypanosomes then disappeared and have never reappeared. The two oxen 

 at the present time are in good health and have evidently recovered. This 

 strain of T. caprce cannot, therefore, be considered of much pathological 

 importance as far as oxen are concerned, but more cases are wanted. Kleine 

 states that cattle are immune. 



Disease set up in Goats and Sheep by T. caprce. — In goats and sheep, on the 

 other hand, T. caprce runs a fairly fatal course. In the list of animal 

 experiments 36 goats and 4 sheep are given. Of the 36 goats, 15 had 

 been infected by wild Q. morsitans and died, on an average of, from 53 to 

 59 days. As the flies were fed on a goat, a monkey, and a dog, and, as 

 a rule, three times on each animal, to ensure that all the flies fed, it is not 

 possible to tell the exact day of infection. 



Four others were inoculated with blood from infected goats or antelope, 

 and these died, on an average, in 57 days. The remaining 17 goats are still 

 alive after intervals of from 61 to 262 days. Of the four sheep, one died in 



