DISEASES OF THE HOG. 137 
wounds about the mouth were the points of entry. 
A number of experiments I made with these bacilli 
were by no means satisfactory, unless injected 
directly into the tissue. I have seen outbreaks of 
this disease in cold weather when everything was 
in an unfavorable condition for the development 
of the bacilli. I consider, from what has been done, 
that it has been proven that the bacilli will cause 
the disease, but how it gains entrance into the 
animal body has not been satisfactorily proven. 
It will make its appearance on a farm where 
everything is favorable for the development of 
the bacilli, and again at other times it will appear 
in a very virulent form where everything is kept 
in the best hygienic condition. The study of this 
disease and the manner in which the outbreaks 
take place are very conflicting. There is room for 
much more work in this line. There are four forms 
of this disease in the pig. First, aphthous fever; 
this form of anthrax commences with loss of appe- 
tite, upeasiness, trembling, anxious and staring 
look, hot mouth and an increased flow of saliva. 
Early in the attack pustules appear on the inside 
of the lip and margins of the snout; they are not. 
numerous, but there is considerable inflammation 
surrounding them which causes the parts to swell. 
The vesicles are at first white, then change to a 
brownish color or in some cases black. They gen- 
erally extend up the nose, which is somewhat 
swollen, giving the animal an ugly appearance. 
Shortly the vesicles burst and the tissue beneath 
sloughs, leaving more or less of a cavity resembling 
