390 



INFECTIVE DISEASES. 



for obvious reasons impossible to ascertain by experiment whether 

 tuberculosis can be transmitted from cows to man by milk or other- 

 wise ; but some light may be thrown upon this important question 

 by ascertaining the result of inoculating bovines with human tuber- 

 culosis. If calves can be infected with tuberculosis from a human 

 source by inoculation or ingestion experiments, and especially if 

 the effect of administering human and bovine tubercle to calves 

 by these means is found to be the same, such experiments will 

 not only serve to dispel any doubt there may be as to the identity 

 of the two affections, but they will strengthen the hands of those 



FIG. 171. TUBERCULOSIS OF PLEURA ; ".GRAPE- DISEASE." 



who insist upon the necessity of more thorough inspection of dairy 

 cows, and of power to deal with tubercular animals. 



Inoculation of a Calf with Human Tubercular Sputum. The 

 author obtained sputum containing numerous bacilli from an 

 advanced case of phthisis. The sputum was shaken up with sterilised 

 salt solution and injected into the peritoneal cavity. A few weeks 

 afterwards the^calf showed signs of illness. The animal looked dull, 

 did not feed well, had a slight cough, and showed less inclination to 

 move about than usual. These symptoms gradually increased, and 

 death occurred forty-two days after inoculation. Extensive lesions 



