464 
JOHN M. PARKER. 
then by Siedamgrotzky and Bber in Saxony, Nocard in France, 
Malm in Norway, and others. 
“ The Danish investigations have yielded exactly similar 
results. Where tnberculosis exists it often has an extent which 
no one had suspected. The discovery produces at first a be¬ 
numbing effect and is always very painful to the owner of dairy 
-stock. Because of this it cannot be made toa emphatic that 
‘there is a great difference between what was formerly tomed 
tnberculosis and what, as a result of the tuberculin test, is now 
indicated by the same word. When a reacting animal is 
butchered, the butcher very often finds no trace of tnberculosis 
and the veterinarian must search carefully to discover the 
little knots on the lymph glands, frequently the only pathologi¬ 
cal signs. 
“ These are especially in the retro-pharyngeal, mesenteric, 
mediastinal and bronchial glands. The majority of reacting 
cows have simply latent tuberculosis. In time this may de¬ 
velop further in many cases. But my investigations have 
shown that such tuberculosis can often remain without develop¬ 
ment for years, and exert no influence on the general health or 
the functions of the animal. We cannot conclude from this 
observation that an animal which reacts with tuberculin is 
thereby condemned to advancing disease, to wasting away and 
final death. The reaction simply indicates the possibility of 
such a result. Whether or not it will prove a reality, we do not 
know.” 
Prof. Theobald Smith in an address to the Harvard Medical 
Alnmni notices the same thing when he says ; “ The need of 
a better education in animal pathology is well shown by the 
work undertaken in this country by public authority to restrict, 
suppress or eradicate tuberculosis among cattle. Tuberculin 
produces a temporary fever in all infected animals, whether 
they be in the earliest stage of the disease or in the most ad¬ 
vanced stages. In fact the not infrequent absence of any lesion 
after a tuberculin reaction is explained by the statement that tne 
focus or foci could not be detected. There are a large number 
