206 CLINICAL DIAGNOSTICS. 



value in cases of suspected tuberculosis where we fail to get 

 a tuberculin reaction, or when a suspected quarter is dry and 

 the possiblity of a direct examination of the milk is excluded. 



Bacteriological Diagnosis of Udder Tuberculosis According 



to Ostertag. 



The most reliable means of recognizing tuberculosis of 

 the udder consists in the inoculation of Guinea pigs with a 

 sample of milk from the suspected udder. 



To obtain reliable results the milk must be procured with 

 proper precautions : Wash the udder with warm water until 

 it is clean, follow this with 50 per cent alcohol and then dry 

 with absorbent cotton. Discard the first ten cc of milk drawn. 



One cc of whole milk is used for the inoculation. Inject 

 this into the muscles of the inner posterior region of the thigh. 

 Upon the appearance of firm, hard, painless and well defined 

 nodules the size of small peas or larger, representing the lymph 

 glands near the point of inoculation, the animals may be 

 killed. These nodules may appear as early as the tenth day 

 after inoculation. If the nodules do not make their appear- 

 ance, the Guniea pigs are killed at the end of six weeks. The 

 presence of tubercle bacilli in the lymphatic glands or in the 

 internal organs demonstrates the existense of tuberculosis. 



V. Diseases of the male sexual organs are usually 

 of a surgical nature. In vesicular eruption we find vesicles, 

 pustules and ulcers, or scars, on the penis. To examine 

 stallions or bulls they may be led up to a mare (or cow) 

 which usually results in a voluntary protrusion of the organ. 

 In bulls manipulation with the hand may answer the same 

 purpose In glanders the testicles may reveal the presence 

 of tumors 



