PSEUDO RABIES IN CATTLE. 
275 
will not try to account for the cause of this peculiar dark color¬ 
ing, but trust that it will be explained during the discussion 
which I hope that I may be able to provoke. 
The arachnoid space was filled with a serous like exudate 
and the ventricles of the brain were always filled with an inflam- 
matory exudate containing more or less blood, and fibrous clots. 
I have no data relative to the histological condition of the brain 
or spinal cord. 
Another peculiar feature of the disease is that there is very 
little bloating after the animal has died. The disease runs its 
course in from one to ten days, usual length from four to five. 
Were these outbreaks of rabies ? I emphatically answer no, 
and I base my opinion on the following facts: 
1st. The Pathology, for in this disease we find marked in¬ 
flammatory changes, and the dark coloring of the membranes, 
while in rabies we find that the inflammatory changes are very 
slight, or entirely absent. 
2d. The Symptomatology is different in this disease. We find 
that the excitable stage resembles frenzy more than fits or con¬ 
vulsions as in rabies, and that this stage is of shorter duration 
and the paralytic stage of longer duration than the correspond¬ 
ing stages of rabies, and there is very little slobbering in this 
disease, while in rabies it is usually very profuse. 
3d. That this disease was confined to localities having simi¬ 
lar conditions as to feed and water, factors which certainly do 
not enter into the localization and distribution of rabies. 
During 1891 this disease, so far as I have been able to ascer¬ 
tain, was confined to the north central part of the state, with 
perhaps an isolated case in other portions of the state, as one 
case that was brought to my knowledge in the western part of 
Plymouth county on the Big Sioux River Bottom where the 
cattle drank from a pond. That portion of the state where the 
disease appeared as an enzootic, is mostly level or rolling prairie 
dotted with small lakes and ponds. In every outbreak that 
I visited the cattle derived their water supply from these ponds, 
with one exception, and in this outbreak the cattle drank from a 
