ANIMAL Diseases. 273 



the mesenter}', the pleural cavity, and sometimes into the peritoneum. 

 In the interventricular groove of the heart one always found some 

 serous exudation, and the vessels lying here were always opaque 

 owing to an infiltration into the vascular coats. 



The condition might be regarded as a sort of chronic Horse- 

 sickness. 



The inoculation of 10 c.c. of Heart-water blood into a clean 

 horse produced similar phenomena, the animal dying two months 

 after inoculation. 



I have only made a few inoculations with Heart-water into 

 horses, and in some cases even a large dose (50 c.c.) has only pro 

 duced a transient febrile reaction. 



During the war camps were formed for the receipt of farmers' 

 horses, and reports reached me that horses running in some of these 

 camps were dying in large numbers from " poverty," " scab," etc., 

 and as these camps are infested with Veld-sickness it seemed to me 

 that probably they were suffering from the " chronic form of Horse 

 sickness," which I had experimentally produced. 



On the 29th December I proceeded to the protection camp at 

 Thorn Park in this district, accompanied by the local officers, Mr. 

 E. White and Mr. Dalton. I saw no dead animals, as these had been 

 already buried, and therefore decided to shoot anyone which I might 

 see in a poor condition. After several hundreds had galloped by, 

 I determined upon one which seemed poor enough, although it 

 galloped quite freely. One of the officers then managed to bring it 

 down with a rifle shot, and we at once proceeded to make a post- 

 mortem examination. 



1. The subcutaneous tissue was not invaded to any definite 

 degree by exudation, although along the lines of the great vessels 

 in the neck there was evidence that it had existed, but had 

 coagulated, and was now in process of absorption, leaving tough 

 lines of dry exudation. 



2. The pleural cavity contained about one gallon of a clear 

 yellow serous fluid. 



3. The lungs showed patches of congestion, some of which were 

 deep, liver-coloured. There was a definite amount of subpleural 

 infiltration of serous fluid. There was also a widespread condition 

 ■of interlobular infiltration of serous exudation. 



4. The pericardium, or heart-sac, contained about 40 ounces 

 of clear yellow or straw-coloured serous fluid and some masses of 

 •coagulated gelatinous material produced by the coagulation of the 

 fluid. 



5. The base of the heart was surrounded by a huge gelatinous 

 mass, and the interventricular groove was filled up by the same 

 inaterial. 



6. The aorta and the larger vessels of the interventricular groove 

 were invaded by the exudation, and the latter were rendered abso- 

 lutely opaque, looking like white clay-pipe stems lying in a jelly. 



7. Some fluid was also found in the peritoneal cavity, but no 

 other characteristic pathological lesion was found. 



