380 Diseases 0/ the Genital Organs 



or 25 per cent. In many cases the fertility appears inter- 

 mittent. For a brief period all copulations fail; then follows 

 a period of fair fertility. If the semen is examined, inter- 

 esting changes are found in the spermatozoa. 



In this inadequately studied field, the best that can at 

 present be done is to study the spermatozoa, their degree of 



FlG. 123 — Purulent Periorchitis ( Empyema of Scrotum) with 

 Necrosis and Atrophy of Testes. 

 /, Vestige of testis sectioned, showing <>n the right remnant of paren- 

 chyma ; j, epididymis ; ,\ vas deferens : ./, scrotal wall turned hack. On 

 the right <>f the right-hand figure the broad white streak between 2 and ./ 

 i-> a deep incision made to keep specimen open: 



the sperm heads. If spermatozoa are abundant but all 

 dead, the tubuli seminiferi must be comparatively sound 

 and death has occurred somewhere in the excretory appara- 

 motility, the frequency of the separation of heads and 

 bodies, and the staining characteristics, size, and form of 

 tus. If the spermatozoa are scant and marked disintegra- 

 tion has occurred, it would appear that the damage may 



