DISEASES OF THE HOG. 137 



Avoimds about the mouth were the points of entry. 

 A number of experiments 1 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, uneasiness, 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 



