564 
A. O. ZWICK. 
with bacilli contained in cow’s milk. He claims to have estab¬ 
lished this as a fact with experiments made at Berne and pub¬ 
lished in Virchow’s Archives in the early seventies of the last 
century. He says that he has found no reason to change his 
views, and calls attention to the conclusive manner in which they 
have been proven by the unimpeachable experiments of Orth, 
Von Behring and Calmette. 
Corter adds his testimony to show that the intestinal mode 
of infection is not rare, and Bougest showed with rats, as was 
shown by the Bureau of Animal Industry, with hogs and cattle, 
that the injection of pure cultures of tubercle bacilli into the por¬ 
tions of the body as remote as possible from the thorax, caused 
pulmonary tuberculosis without intermediate lesions to connect 
the location of the disease in the lung with the portal at which 
the infecting* bacilli were introduced. 
Vargas, in his article before the sixth International Congress 
on Tuberculosis, well says, the lung has a very important func¬ 
tion ; it filters or strains the foreign particles from the blood, re¬ 
taining the bacilli. 
Calmette and Guerin have shown that pulmonary anthraeosis 
does not occur through the inspired air directly, but after the 
coal-dust has first been absorbed by the mucosa of the digestive 
tract and then passed on to the lymphatic system. 
Sir Wm. Whitla and Symmers, inspired by these experi¬ 
ments, introduced into the stomach or peritoneum of animals 
India-ink and coal-particles; they passed the intestinal epithelium 
without leaving any trace, reached the nodes and lymphatic ves¬ 
sels, and from them passed on to the blood, to be detained by the 
pulmonary capillaries. 
Enough, I think, has been here quoted and submitted from 
the many investigations that have been carried on to serve to 
prove the fact that tubercle bacilli can and do penetrate the wall 
of the digestive tract without affecting it and pass to the lung 
and there cause lesions, that it will not be necessary to go farther 
into this aspect of the question; it has been abundantly demon¬ 
strated that the intestinal mode of infection for pulmonary and 
