TRANSACTIONS OF SECTION I. 033, 
Srecrion I.— PHYSIOLOGY. 
PRESIDENT OF THE SEcTION—Colonel D. Bruce, C.B., M.B., F.R.S. 
The President delivered the following Address at Johannesburg on Tuesday, 
August 29 :— 
The Advance in our Knowledge of the Causation and Methods of Prevention 
of Stock Diseases in South Africa during the last ten years. 
Tren years ago, when I first came to South Africa, I was led to take an interest 
in the various great stock diseases which do so much damage and so retard the 
progress of South Africa as a stock-raising country. I thought, therefore, that a 
good subject for my address, in the centre of the foremost stock-raising Colony of 
South Africa, would be a review of the work done in advancing our know- 
ledge, during the last ten years, of the causation and methods of prevention 
of stock diseases in South Africa. 
South Africa is particularly rich in animal diseases, every species of domestic 
animal seemingly having one or more specially adapted for its destruction. Now 
it is evident that, in an address of this kind, it will be impossible to take up every 
stock disease, but I think you will agree with me that those shown on this table 
are among the most important :— 
East Coast Fever ; ordinary Redwater or Texas Fever ; Biliary Fever of Horses ; 
Malignant Jaundice of Dogs; Nagana or Tsetse-fly Disease ; Trypanosomiasis of 
Cattle; Rinderpest ; Horse-sickness; Catarrhal Fever in Sheep; Heart-water of 
Sheep, Goats, and Cattle. 
Now we may group these diseases in various ways; for example, as below, 
where they are divided into two main divisions: A division, in which the parasite 
is known; and B division, in which the parasite is unknown. 
A. Parasite known. 
I. Diseases caused by parasites belonging to the genus Piroplasma :— 
1. East Coast Fever (Koch), P. parvum. 
2. Redwater or Texas Fever, P. bigeminum (Theiler). 
3. Biliary Fever of Horses, Mules, and Donkeys, P. equi. 
4. Malignant Jaundice of Dogs, P. canis. 
II. Diseases caused by parasites belonging to the genus Trypanosome :— 
1. Nagana or Tsetse-fly Disease, 7. brucei (Bradford and Plimmer). 
2. Trypanosomiasis of Cattle, 7. theileri (Bruce). 
