TTJBERCULO-INFECTION OF MAN. 
565 
other forms of tuberculosis, unlike the inhalation mode directly 
into the lung tissue, is not merely a theory, but a well-established 
truth which has forced its way to recognition in the face of con¬ 
siderable opposition. Neither can the prevalence of tuberculosis 
as a pulmonary disease be used, as even so great an observer as 
Koch did, as an argument to underestimate the danger of tubercle 
bacilli in dairy products; on the contrary, the mode of infection 
with tuberculosis, the certainty with which tubercle bacilli may 
enter one portion of the body and leave it entirely unaffected 
and cause disease in other remote portions of the body, condemns 
dairy products infected with tubercle bacilli as a serious menace 
to public health. 
Continuing to quote from the Government report: We may 
also conclude, as far as it is possible to test the vitality and viru¬ 
lence of tubercle bacilli from different sources and in different 
environments, that those from cattle are, as a rule, the most viru¬ 
lent, and that it would seem clear that dairy products generally, 
and butter especially, supply an ideal medium for the preservation 
of both the life and the virulence of tubercle bacilli. It might be 
mentioned that the danger from meat is, as a matter of course, 
minimized, because of the heat as a rule applied in preparing it 
for the table, be it by cooking, roasting or other methods, as the 
case mav be. 
w/ 
Therefore the elimination of tuberculosis from the dairy herd 
is urgently recommended, not only because tuberculosis among 
cattle is a serious cause of pecuniary loss, as Uncle Sam’s report 
has it, so serious indeed that from the strictly economic point of 
view it must be regarded as the most important problem that 
those interested in animal husbandry can undertake to solve, but 
because, as I hope I have been able to show you, the protection of 
the public health urgently requires it. 
I feel that in thus presenting for your consideration anato¬ 
mical facts co-ordained and brought into intimate relationship, 
I have submitted matter of the gravest import concerning the 
problem of We causation and spread of tuberculosis. 
I feel that there is basis enough to warrant the most thorough 
