BOTRYOMYCOSIS. 208 
In general, botryomycosic tumors grow gradually, and little by little in- 
vade the adjoining 
tissues. Like ordi- 
nary fibrome, they 
leave intact the sur- 
rounding lymphatic 
vessels ; by excep- 
tion they extend to 
some distance by 
continuity and by 
contiguity of tissues ; 
and thus they may 
each serous cavities 
and certain viscera, 
especially the lungs. 
Inthe horse, most 
of the fibrous growths 
hollowed by  sup- 
Fig. 51—Botryomycosis of the shoulder and chest purating fistule are 
(from a photograph). related to  botry- 
omycosis ; the pus that escaped from them contains very small granula- 
tions, grayish in color and formed by 
the botryomycetes. To insure the di- 
agnosis, one can color with picro-- 
carmine a drop of the pus and ex- 
amine it under a microscope of low 
power, when the parasitic masses, 
colored in yellow, will appear in vary- 
ing number, ordinarily under the 
form of ‘blackberries,’ masses or 
clusters more or less voluminous, and 
formed of micrococci associated in 
zooglocia, sometimes in large disks 
lightly granular. 
Until lately, the treatment of bot- 
ryomycomas has been exclusively 
surgical. First they enlarged the fistu- 
lous tract, used antiseptic or escharotic 
injections and actual cauterization. / 
As these processes generally failed, Fig. 52—Botryomycosis of the tail 
it was necessary to have recourse to (from a photograph). 
ablation of the tumor, When it is of small dimensions, the operation 
g a 
Es ae 
4 
