SYMPTOMS AND PROGRESS OF SHOULDER ABSCESS. 
229 
by applying a bandage, when abscess on the shoulder was shortly 
developed. 
Similar swellings are produced by a peculiar parasite, named by 
Rivolta Discomyces equi. This organism has also been frequently found 
in cases of scirrhous cord, in swellings due to harness pressure, in 
mammary growths, in growths about the tail, and even in the lung and 
in bone. 
Cadiot and Dollar relate two such cases. (See. pp. 477—479, “ Clinical 
Veterinary Medicine and Surgery.”) Iodide of potassium was unsuccess- 
Fig. 117._Multiple abscess formation in the shoulder-region due to Discomyces equi. 
(Bothryomycosis.) 
fully tried in these and in 22 other cases of bothryomycosis. In almost 
every instance, however, recovery followed ablation. 
Two factors are at work—collar-pressure and infection. The former 
certainly favours development of micro-organisms in the mastoido- 
liumeralis muscle or prescapular glands, but the method of infection is 
less clear. It seems possible that micro-organisms may enter the injured 
lymph-glands with the lymph-stream, or that they may be pouied into 
the disease-focus along with the extravasated blood. Schmidt inoculated 
several oxen with Kitt’s symptomatic anthrax lymph, but only one 
animal, which had been struck with a stick, developed antlnax and 
showed the characteristic swellings. Rosenbach broke the tibine of 
rabbits, into whose blood-stream he had previously injected cultures of 
bacteria, and noted severe inflammation at the injured spot. Still it is 
