110 
JNO. M. PARKER. 
their development there, and the closest inspection fails to re¬ 
veal any augmenting foci of disease. These statements are 
based on careful examination of slaughtered cattle, and the 
thorough testing of milk from advanced cases.” 
Practically, then, the danger is confined to cases in which 
there is disease of the udder; such cases are comparatively rare. 
There are, I believe, no authoritative statistics showing more 
than from 2^ to 3)4 of cases of disease of the udder among 
tuberculous cows. My own experience does not give as high a 
percentage as that. In Pennsylvania, Dr. Ridge gives the per¬ 
centage of tuberculosis of the udder in the neighborhood of 3, 
per cent. Dr. Peters gives it as “ very small.” Dr. Burr gives. 
12 cows out of 300 cases of tuberculosis as having diseased 
udders, and Theobold Smith says, “fortunately tuberculosis of 
the udder is rare. Among 200 infected animals he has only 
seen one case of udder disease, and 16 others, which, according 
to post mortem studies, may have shed at one time or another,, 
tubercle bacilli into the milk in small numbers, but which had 
no recognizable disease of the udder itself.” He further says 
“ the large percentage of udder tuberculosis reported by several 
writers lately is incompatible with all former statistics, and in¬ 
dicates either an unprecedented condition in certain localities, 
or else an error in diagnosis.” 
And finally, in the Annual Report of the State Board of Cat¬ 
tle Commissioners, in reports of post mortem lesions, while 
disease of lungs, mediastinal glands, bronchial glands, etc., are 
reported, there is no mention made of even a single case of 
disease of the udder. 
But the best evidence of the absence of ere at danger is found 
in such statistics as are collected by Dr. Watson and presented 
in the Report of the State Board of Health of N. H. for 1892. 
These statistics are collected from slaughter-house reports, prin¬ 
cipally in Germany, and, as Dr. Watson points out, “ calves are 
fed exclusively on cows’ milk, so that they offer by far the best 
of natural experiments as to the amount of danger to human 
beings from raw cows’ milk.” 
