MY EXPERIENCE WITH BLACK LEO VACCINE. 
105 
and the spirit to investigate and endeavor to inquire into the 
causes which lead up to the changed conditions, the ultimate 
consideration of what would be the best remedy to apply and 
the particular methods under which the application may be 
made, such a farm unquestionably offers the most perfect features 
of an ideal experiment station. If by recurrence, endemic 
disease is proven to be permanently established in any particular 
section of the territory, the particular time of its recurrence, the 
climatic and atmospheric conditions, under which it recurs, the 
severity with which the periodic outbreaks manifest themselves, 
the particular grades or species of animals which are more or 
less susceptible to the invasion, the physical condition which 
more readily succumbs to the attack, the principal channels or 
media which facilitate the spread and dissemination of the con¬ 
tagious and infectious principles, and finally, the agents and 
methods which are most effectual in the control and stamping 
out of such disease. 
The opportunities for engaging in experimental work of this 
kind on an extended scale by the simplest and yet most effective 
methods can be found only on the stock-farm, where the pro¬ 
fessional student, willing and able to grasp and profit by them, 
finds that the lessons there offered him, constitute a valuable 
post-graduate course. 
MY EXPERIENCE WITH BLACK-LEG VACCINE. 
By M. V. Byers, V. S., Osceola, Neb. 
A Paper read before the Nebraska Veterinary Medical Association, February 21, 1899. 
My experience with black-leg vaccine has been somewhat 
imited. Perhaps some of my brother or fellow practitioners 
have had more experience in this line than myself. During 
the months of January and February, 1898, I vaccinated nearly 
600 head, ranging in age from six months to two and one-half 
years of age. During the early part of January, 1898, I was 
called out to examine some cattle which had been dying of some 
unknown disease. Upon arriving I found several dead animals, 
