Non- Venereal Infections which Invade the Genitalia 329 



because in most cases copulation is promptly and absolutely 

 excluded and venereal transmission thereby avoided. 



A very interesting abattoir specimen is illustrated in 

 Fig. 61, in which there has been a rupture of the prepuce 

 and also tubercular infection at the tip of the glans penis. 

 The rupture of the prepuce probably furnished the avenue 

 for the tuberculous invasion. 



Tuberculosis of the submucosa of the glans is illustrated 

 in Fig. 96. This specimen shows numerous tubercles in 

 the submucosa. They were not recognizable clinically. The 

 disease was brought to a crisis by the larger tuberculous 

 abscesses in the prepuce and about the base of the glans, 

 which rendered protrusion of the penis impossible. 



(2) Tuberculosis of the penial sheath is presumably rare. 

 In my collection I have but one well defined specimen. It 

 was obtained from the abattoir and is without clinical his- 

 tory. Fig. 93 indicates that penial incarceration occurred 

 early, rendering the animal impotent and causing him to 

 be sent to the shambles. Clinically, the condition could not 

 well have been differentiated, . upon ordinary examination, 

 from other infections of the sheath wall, especially actino- 

 mycosis. Amongst chronic infections, however, tuberculo- 

 sis is by far the most probable, and a provisional diagnosis 

 of tuberculosis should be made. The tuberculin test may 

 serve as an aid, but is subject to severe limitations. If it is 

 reasonably certain that the bull was tubercle-free prior to 

 the development of the lesion, the test possesses great value. 

 Exploratory incision through the external skin, and the re- 

 moval of material for bacterial and inoculation studies, is 

 of great diagnostic value. 



So long as the bull can protrude the penis and copulate, 

 he constitutes a serious menace. Since the infection is pri- 

 mary, and the fundamental lesion in the mucosa is natu- 

 rally open, any tuberculous excretions occur within the 

 sheath. The glans penis inevitably becomes contaminated, 

 but not necessarily infected. In copulation, however, the 

 surface contamination is carried into the vulva and vagina 

 of the female. In protruding the penis, as will be under- 



