TUBERCULOSIS 525 



In cattle the miliary tubercles are larger than in 

 man, and form bunches sometimes as large as grapes. 

 They adhere or grow out from the membrane which 

 lines the chest (pleura), and the membrane which lines 

 the abdomen (peritoneum). They also invade the 

 lung tissue, the lymph glands, mammary glands, 

 mesenteric glands, the liver, kidneys, bowels, womb, 

 testicles, brain, etc., etc. 



If we now have recourse to the microscope, and 

 make an examination of a recent tubercular growth 

 in an acute case of generalised tuberculosis, we find 

 it is made up of a number of cells like those found in 

 the blood (leucocytes), like those found in a wound 

 (granulation cells), like those found in the skin 

 (epitheloid cells), and, although last not least, one or 

 more micro-organisms belonging to the class termed 

 '* Bacillus Tuberculosis." 



This bacillus has been singled out and grown on 

 blood serum, glycerine-broth, glycerine-milk, glycerine- 

 agar, agar, potatoes, etc. If the cultivation material 

 be injected into the subcutaneous tissue, or into the 

 blood stream, or into the chest, or into the abdomen, 

 or into the anterior chamber of the eye of rabbits 

 or guinea-pigs, in about three weeks they exhibit 

 symptoms of tuberculosis, and on post-mortem ex- 

 amination tubercles are found in the various oro-ans 

 of their bodies. 



Cause. — It is therefore certain that the cause and 

 spread of tuberculosis is the introduction of the living 

 parasite, the '' Bacillus Tuberculosis," into the body of 

 the individual or animal, and without its introduction 

 and multiplication within the body, the disease tuber- 

 culosis, or consumption, could not make its appear- 

 ance in either the human subject or the lower animal. 



Regarding the experimental transmission of the 



