BOCJS FEEDING ON INFECTED TJ S.SUES. 281 



animals inhabiting the Fly Country harbour the Nagana parasite, 

 and the links in the chain of the causation of this disease con- 

 necting the game through the Tsetse-ily with the domestic 

 animals are complete. 



" In regard to other points relating to the eticjlogy of this 

 disease, such as seasonal prevalence, sex, age, breed, etc., I may 

 dismiss them in this Interim Report by the remark that, according 

 to my present knowledge, neither season, sex, age nor breed has 

 any predisposing or protective influence iu this disease" (p. 24). 



Pages 25 to 41 are devoted to a — " Descriptiox of the Fly 

 Disease or Nagana as it occurs in the Domestic Animals " 

 (horses, donkeys, cattle, and dogs), with temperature charts, 

 showing " fluctuations in the number of the blood corpuscles and 

 parasites," and a " short description of the principal changes 

 found on post luortem examination." 



Fig. 14. 



Dog suffering from Tsetse-rty disease, or Nagana 

 (after Bruce). 



Of the remaining portion of the "Report," pp. 41 to 45 arc 

 devoted to experiments on — " Inoculation of Blood from 

 Affected to Healthy Animals." — 



A.—" Inoculation of Blood in which the HiEMATozoA 

 can be Demonstrated by the Microscope " (pp. 41-45). 



B. — " Inoculation of Blood in which the HiEMATOzoA 



CANNOT BE DEMONSTRATED BY THE MICROSCOPE " (p. 45). 



On p. 46 is given a statement of an experiment on — 

 "Feeding Healthy Animals on Tissues from Animals 

 affected by Nagana." A native dog, after eating a piece of 

 coagulated blood from the heart of a heifer, Exp. 216, was found 

 to be suffering from the disease on the sixth day. 



In connection with this experiment the author remarks : — 

 " In the Segane Valley, many of the dogs belonging to one of 

 the kraals fed on the raw flesh of a quagga, and I am informed 

 that several of these dogs subsequently died of Nagana. 



"Mr. B. G. Lloyd also states that in the winter of 1892, 

 Mr. Saunderson, of Spitz Kop, Z.A.R., took some oxen into the 

 << Fly " hunting and lost them all, though one of them died after 

 returning to the farm. Some dogs got at the dead bullock and 



