The General Infections of the Genital Organs of Cattle 365 



used frequently, with no conceptions. The sudden sterility 

 of about 75 per cent, of the herd had been thought to be due 

 wholly to the condition of the cows. A large proportion of 

 the cows (36.5 per cent, of those served) showed macro- 

 scopic pathologic changes, especially cervicitis, but only in 

 a few cases of sufficient severity to account for sterility on 

 such a large scale. 



Fig. 113 — Spermatozoa from Bull No. 4. 



Number comparatively low. Cells non-motile when ejaculated. 

 Many Tailless Spermatozoa. 



On Dec. 5, physical examination revealed a severe balano- 

 posthitis and testicles slightly atrophied, with slightly di- 

 minished tone. Coitus was normal. About 7 mils, of semen 

 were obtained, which was very viscid, of a light straw 

 color, and more translucent than normal. 



The spermatozoa were non-motile. About fifty per cent, 

 of the normal number were present. In fresh specimens, 

 many spermatozoa lay upon their sides, giving the appear- 

 ance of extremely narrow heads. In stained preparations 



