240 



The Biochemistry of Semen 



Urea, in semen, 32, 116; effect on 

 sperm, 55 



Urechis caupo, creatine and creati- 

 nine, 180 



Urethral glands, 15, 37-8 



Uric acid in semen, 32, 123 



Vitamins, role in reproduction 

 and semen formation, 23, 72, 

 148-9 



Vitrification, 64-6 



Volume of semen, 1-2, 31-6 



Washing, effect on sperm, 79-84 

 Wave motion in semen, 41 

 Witte's peptone, in semen diluent, 



80 

 Wolffian duct, 21 



Xanthine oxidase, 22, 123 

 X-rays, effect on sperm, 58-9 



Zinc, in semen and prostate, 19, 



88-9 

 Zymohexase, 157 



