102 
A. DRINKWATEK. 
tiuual inoculation of young sheep must lead to continued out¬ 
breaks of ovina variola in a milder form, which conserves the 
contagium, and in all probability contributes to an extension of 
the ovina varolic pest; this form of prophylaxis is only then ad¬ 
vantageous, when extended to all sheep without exceptions, and as 
carefully regulated by the veterinary police as if a natural pest 
were devastating the land. There is no doubt, that the frequent 
and devastating outbreaks of v. ovina in North Germany are 
owing to the custom of ovination which prevails there, (and which 
deports itself in the same manner as variolation in the last cen¬ 
tury), without subjecting the herds with the artificial disease, to 
the same restrictions to which such are subjected when the natural 
disease is prevailing. Ovination, has luckily by us in Germany, 
passed its days of bloom. 
From the entire pathology of v. ovina, we see that the same 
and v. humana are throughout homologous diseases which, while 
corresponding in every direction, yet stand at present in no direct 
relation to each other. In no case has it been observed that v* 
ovina proceeds from v. humana, or vice-versa. An important 
property, which is however common to all forms of variola, 
appears to be, that vaccina, the relation of which to v. humana we 
shall presently discuss, has the ability to protect sheep from out¬ 
breaks of v. ovina. 
[to be continued.] 
TYPHOID FEVER IN HORSES. 
By A. DRINKWATEK, V.S., Rochester. 
Read before the Rochester Veterinary Medical Association. 
-—:o:-— 
During the summer of 1876, while practicing in Belleville, 
Canada, I had a great number of cases of typhoid fever in horses, 
a few of which I will endeavor to describe, also the treatment 
which was adopted. 
My first case was a six-year-old horse, the property of a Mr. 
Yandusen, a mill owner of that town. The stable in which this 
