RELATION OF BOVINE TO HUMAN TUBERCULOSIS. 
601 
the morbid process by the formation of a dense, .firm, fibrous, 
limiting membrane, surrounding such morbid processes. 
Third .—The ulcerative condition so frequently met with in 
man is not so common in cattle. 
Fourth .—Septicsemic conditions that so constantly accom¬ 
pany pulmonary tuberculosis in man are rarely seen in cattle, 
except in the very last stages of the disease. 
Fifth .—The anaemia, rapid loss of flesh and strength, so con¬ 
stant in tuberculosis of man, are not seen in cattle, except in 
the latter stages of extensive morbid lesions. 
Sixth .—Tuberculin has very little, if any,'deleterious effect 
on cattle, whereas it is supposed to have a marked influence on 
the germ, arousing an activity in latent conditions of the dis¬ 
ease in man. 
Seventh. —Differences, though slight as they may at first ap¬ 
pear, indicate that the cow is the natural harbinger of this 
germ ; or at least that nature has endowed cattle with much 
stronger powers of resisting the invasion of the tubercular ba¬ 
cillus. 
If the disease is wholly or even largely distributed by tuber¬ 
cular people, why is it that in China the disease is quite 
prevalent among the wealthier classes, who are surrounded with 
the better conditions of life, while it is very rarely found among 
the poorer classes, who live, to use the expressive slang phrase, 
“any old way ” ? Why is the disease not transmitted from the 
wealthier to the poorer classes ? Would it not be reasonable to 
expect that after it had once gained access to the haunts of 
these poorly clothed, illy housed, and precariously fed people of 
the poorer class, that it would spread among them with more 
rapidity than it would among those whose surroundings are bet¬ 
ter in every way, and less favorable to the development of the 
disease, except that the wealthier classes use the food products 
of the cow ? 
If the disease had been but recently introduced into this 
country by a few persons having contracted it in some foreign 
country, it would be easy to arrive at satisfactory conclusions, 
