196 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 possibility 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. Ihese nodules may appear as early as the tenth day 

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

 ance, the Guinea 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 existence of tuberculosis. 



V>. ]\r a 1 e Sexual Organs. 

 V. Diseases of the male sexual organs are usually of 

 a surgical nature. In vesicular eruption we find vesicles, pus- 

 tules and ulcers, or scars, on the penis. To examine stallions 

 or bulls they may be led up to a mare (or cow) which usual- 

 ly results in 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 knots. 



Diseases of the Sexual Organs. 



Torsio uteri, torsion of the womb, of interest in internal medi- 

 cine only when parturition or pregnancy is excluded. Animals are 

 restless, kick belly witli hind feet and have pains of labor. Exami- 

 nation of vagina gives necessarj- information. 



