266 Report S.A.A. Advancement of Science. 



2. Oxen from Cradock (14) arrived at Grahamstown on Decem- 

 ber 2nd, 1 90 1 : — 



I died on 24th December. 



I died on the 25th December. 



X died on the 30th December. 



I died on the 2nd January, 1902. 



I died on the 3rd January, 1902. 



I died on the 7th January, 1902. 



I died on the nth January, .1902. 



12 died on the 12th January, 1902. 



I died on the 13th January, 1902. 



I had an op|^X)rtunity of examining some of these animals, and 

 was able to determine the identity of this disease with that which 

 I had formerly seen occurring spontaneously, and with that which I 

 had produced by the inoculation of clean animals with Horse-sick- 

 ness blood. 



While the Kafirs call this by the term Imapunga, I have found, 

 by consulting transport riders whose experience extended over many 

 years, that this disease is known to them under the name of Veld- 

 sickness, or Veldziekte. 



The principal lesion is an exudation of a yellow serous fluid into 

 the following structures: — 



1. Subcutaneous, in and along the lines of the intermuscular 

 fasciae. 



2. Sometimes, but not always, in the pleural cavity. 



3. Commonly into the interlobular tissue of the lungs. Some- 

 times it is present to an exceedingly light degree here, and it is 

 necessary to examine carefully to determine where the normal 

 becomes abnormal since the interlobular tissue in ruminants 

 is more than in the equids. In very many cases, however, one 

 finds the interlobular infiltration forming bands from one-eighth to a 

 quarter of an inch in thickness. 



4. Into the pericardium. The amount found in this situation 

 varies within wide limits; in some cases it is but little in excess, 

 while in others the pericardial sac is filled. A variation is to be 

 •found also in Horse-sickness. I have found in some horses only a 

 few ounces of fluid, while in others more than half a gallon was 

 found in the sac. 



5. Around the base of the heart. 



6. In the anterior mediastinum. 



7. Between the lower border of the pleura and the diaphragm. 



I have several times found the exudation here to form a solidified 

 layer nearly half an inch in thickness. 



8. Into the tissue of the omentum and mesenter\'. 



9. Into the submucosa of the intestines. 



Secondary lesions : — 



I. Collapse of lobules of the lung, with a corresponding trau- 

 matic emphysema of the adjoining lobules. 



