272 
G. A. JOHNSON. 
which remained for about an hour. The circulation remained 
unaltered. Owing to the idiosyncrasies of different animals, 
more intensified action will be noticed in one case than another 
from the same size dose; also after a particularly large dose 
some transient irregularities might be anticipated. I have 
experienced considerable trouble from time to time in getting a 
good article of the drug, but where I have had a uniformly good 
article of the drug I have usually secured uniformly good results. 
I have generally found the crystals of cocaine to be of more 
certain and uniform strength than the powder, and a good 
article, in my experience, is of a rather clear or opaque color, 
more like hydrate of chlor., only the crystals are much smaller. 
I have not had much to do with the aqueous solutions kept 
in stock by the druggists, but prefer getting the crystals, which 
dissolve readily in a little water, and mix fresh for each using. 
Some operators have condemned the use of cocaine hypo¬ 
dermically, claiming to have encountered troublesome swell¬ 
ings, ulcers, etc., from its poisonous effects, but with all deference 
to the surgical knowledge of such operators, I would say, if the 
drug is pure, made up fresh, and the instrument thoroughly 
antiseptic, they will encounter no further trouble of that kind. 
PSEUDO RABIES IN CATTLE. 
By G. A. Johnson, D.V.S., Sioux City, Iowa. 
A paper read before the Iowa Veterinary Medical Association. 
GENTLEMEN: —When your secretary requested me to prepare 
a paper for your consideration at this meeting, the question 
arose, what should I take for a subject ? After considering the 
matter for some time I resolved to give you, as brief as con¬ 
sistency will allow, the results of my investigations of a disease 
that was quite prevalent among cattle, in certain sections of 
the state during the summer of 1891 and spring of 1892. 
I present this subject not so much with the view of telling 
what it is, as to show what it is not. But as several of the vet¬ 
erinarians of the state have had more or less experience with the 
