The General Infections of the Genital Organs of Cattle 367 



Ordinarily the filament is so small that special staining is 

 required to show it. The nuclear portions of the heads were 

 uniformly undersized. It was ordered that this bull should 

 have complete sexual rest until further study should deter- 

 mine a more normal condition of the semen and sperma- 

 tozoa. 



Jan. 29, 1920. Motility still absent and fewer spermato- 



Fig. 115 — Spermatozoa from Bull No. 5. 

 Spermatozoa motile, but heads abnormally narrow and nuclei very small. 



zoa. About fifty per cent, of the spermatozoa were tailless. 

 Many of the heads had a very narrow tapering basal por- 

 tion, running to a point at its juncture with the neck. The 

 nuclear portion was generally differentiated, but not as dis- 

 tinct as normal. The neck granules were very small and 

 generally imperceptible. 



Mar. 6, 1920. Physical examination revealed no changes. 

 Twenty mils, of semen were obtained, containing considera- 

 ble vaginal mucus. The semen was very viscid, and at first 



