TUBERCULOSIS. 387 



Ehrlicli's Method and Eosin. — The author has found that after sections 

 have been stained with methyl-violet and Bismarck-brown by Ehrlich's 

 method, as described by Koch, they may with advantage be immersed in 

 a weak alcoholic solution of eosin, then rinsed in clean absolute alcohol, 

 clarified with clove-oil, and mounted in Canada balsam. The giant cells 

 are then stained pink, while their nuclei are brown, and the bacilli blue. 



Tuberculosis' in Man. 



The disease manifests itself in various forms in man, and most 

 frequently in the lungs, producing phthisis or consumption. The 

 sputum contains the bacilli in large numbers, and is extremely 

 virulent. Scrofula and lupus are forms of tuberculosis ; they are 



Fig. 168. — Section thkough a Lupds nodule oi' the Nose. 



probably produced by an attenuated variety of the tubercle bacillus. 

 Lupus can be distinguished from tuberculosis of the skin ; and 

 scrofulous lymphatic glands are distinguished from tubercular glands 

 by the tendency of the latter to produce generalised tuberculosis. 

 This difference in the intensity of the virus in the two cases, 

 Lingard illustrated by the effect upon inoculated guinea-pigs. 



Cavities in the lungs are often thickly lined with bacilli. They 

 are present in great numbers in the caseous matter, though in 

 equine and bovine tuberculosis this is not the case. 



Whether the disease in man is contagious is an open question, 

 though numerous cases of supposed communicatioa between husband 

 and wife, brothers and sisters, have been reported, and Rausome 



