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TWENTY-SEVENTH ANNUAL MEETING 
tamination ? Cannot that he carried witnont putrefaction ? Cer¬ 
tainly it can. We have some two or three years old that is still 
kept without putrefaction. If the material be gathered perfectly 
pure before contact with the air and then promptly sealed, it is 
possible to carry it any distance. And that is the way our material 
is gathered. This gathering of the material was simply part of 
our work. We are still experimenting and if any discoveries are 
made we will state them. 
I have not attempted to give any method of modification of the 
virus, as I have not modified it at all. If a germ of Texas fever 
is passed through Northern cattle, it will produce fever of the same 
symptoms as Texas fever, the same effect in the blood corpuscles. 
It is already modified by nature, and it is not necessary to modify 
it by any mechanical processes. So it is possible to produce it to 
some extent, and we can produce immunity for a while simply by 
virus taken from one of our own cattle suffering from the disease. 
On the question of immunity I have one more word. If the 
disease were of the nature of malaria, how could we explain on 
that theory the fact that Southern cattle are immutable against 
Texas fever ? How can we explain the fact that the cattle of 
Texas always exposed to the infectious soil, are immuned? By 
what possible method do they become immuned ? How do they 
gain that immunity? We take Northern cattle to Texas and 
within ten days in the summer months, they die of Texas fever. 
We take Texas cattle to Northern pastures and in thirty, forty or 
fifty days in our pastures they die of fever. But you take the 
calves born on Texas soil and constantly exposed to this germ, 
very few die of Texas fever. Take these same cattle North for 
three months and return them to the South and they will take 
Texas fever and die from it. If that is the fact, these cattle must 
have had immunity by some method on the Southern soil which 
they lost on the Northern soil. After losing it on the Northern 
soil, they die of Texas fever. That is not an experiment. I have 
seen it myself time and time again. Now then if this immunity 
is gained it must be through some kind of virus. I have found 
that the Southern cows so far as our experiments go are somewhat 
affected, or at least contain in their blood at some time or other, 
