TWENTY-FOURTH ANNUAL REPORT 87 
During the winter an aged horse with a large bone spavin 
was presented to the Park for slaughter, which on account of 
lameness was useless to the owner. The animal’s temperature 
was normal, and it was in a fair condition of flesh. When the 
animal was examined after slaughter the following conditions 
were noted: 
The peritoneum and especially the peritoneal surface of the 
diaphragm was studded with tubercles of the size cf peas. The 
spleen showed numerous lesions of tuberculosis, resembling the 
typical miliary tubercles found in bovines. Most of them show- 
ing considerable fibrous tissue incapsulation, but occasionally 
some slight caseation in the centers, none, however, showed any 
calcification. Few of the thoracic lymphatic nodes showed any 
caseation, although many of them were much enlarged. The 
liver showed a great many miliary tubercles on the surface 
of the capsule. The lungs were studded with miliary tubercles 
on the surface as well as throughout its structure. The posterior 
border of the left lung for a distance of ten inches was incased 
in a fibrous capsule, half an inch thick, while the lung tissue 
in this area was nearly entirely replaced by a cream colored 
material of gelatinous consistency, with numerous small necrotic 
areas throughout. The pleura presented the same appearance 
as the peritoneum, that is covered with miliary tubercles with 
a great deal of fibrous tissue, while other lesions showed caseous 
centers. 
While a number of investigators have recorded tuberculosis 
in the horse prior to 1882, when Koch discovered the specific 
bacillus of the disease (Bacillus tuberculosis), still it must be 
noted that these reports of the clinical and pathological lesions 
read more like glanders than tuberculosis. 
Although equine tuberculosis cannot be described as a com- 
mon disease, it is probable that a number of cases have been 
overlooked in the past, or ascribed to other affections, as the 
symptoms of the malady are often very obscure. 
It will be of interest to learn that of the one thousand horses 
killed in our abbatoir, the present case of tuberculosis is the 
second that has come under my observation. 
