242 IOWA DEPARTMENT OF AGRICULTURE 
present the results were not so good, but we did not doctor a herd 
where we did not get good results. I do not know what could be done if 
the disease had actually appeared. So far we have concerned ourselves 
with preventing the disease rather than in curing it. There is no ques- 
tion but that the method, if properly carried out, would solve the ques- 
tion of preventing hog cholera. There would be no need of its spread- 
ing over a whole country if you could get hold of the serum to use on 
the herd. We find that the single vaccination is a little more easily car- 
ried out and I consider that the application of this vaccine ought to be 
in the hands of a competent man. Of course the amount of virulent blood 
used is exceedingly small and care should be taken in its use. Virulent 
blood is used hyperdemically. We always used one syringe for serum and 
one for virulent blood. It is injected in the side. 
Mr. H. M. Yoder of Ues Moines, Iowa, asked what effect it had 
upon an animal, whether or not it would retard the growth or fitting 
for allows. Dr. Niles replied: ''There is no retarding influence 
whatever. They may be a little stiff the next day, but there is no 
indication except that the hog is in good health. We could not find 
that they suffered any inconvenience Avhatever, you would not know 
there was anything the matter ; they seemed to thrive by associating 
with the sick hogs. It does not stunt them in any manner. It 
does not give the animal the disease. There is no disease induced 
by vaccination. When people are vaccinated a great many of them 
are feverish for a few days, but that is not the case with serum 
vaccination in hog cholera." 
In reply to a question asked as to whether the government con- 
templates giving out this preparation Mr. Niles said: ''I am not 
prepared to state what action the different states will take. I do 
not know just what will be done, but the idea is to interest the dif- 
ferent experiment stations so that the merits of the method will be 
more widely spread and the people can learn about it." 
Claude Huffman, Scranton, Iowa, asked Dr. McNeill concerning 
the symptoms of tuberculosis in hogs to which he replied : "A good 
many times there are no symptoms. A great many of the hogs that 
go to the market you can't tell that they are tubercular. However, 
if the glands on the neck swell and the hog gets short-winded it is 
a pretty good sign. A good many times if the lungs are filled up 
with a tubercular mass you can see their sides move. When they 
get it in a very bad form you will find enlargement in the region of 
the neck and sometimes it forms large abscesses, but aside from that 
you will not be able to tell. If you keep them long enough and the 
process of the disease is extensive enough they run down, get in bad 
shape, cough, will not eat and will not do weU, but ordinarily you 
