TEXT FIGURES 



PAGE 



1 Diagrammatic representation of a spermatozoon 4 



2 'Ripening' process in the epididymis of the mouse 7 



3 Schematic representation of the head of a bull spermato- 



zoon before and after detachment of the galea capitis 13 



4 Diagrammatic outline of male accessory organs to illustrate 



the localization of fructose 16 



5 Diagram of osmotically active substances in prostatic 



fluid 18 



6 Relation between volume of ejaculate and content of 



fructose and citric acid in rabbit semen 31 



7 Composition of boar semen fractions collected by the 



'split-ejaculate method' at half-a-minute intervals 37 



8 Fructolysis in bull semen incubated at 37° 47 



9 Effect of fluoride on the respiration and aerobic fructolysis 



of ram semen 51 



10 Effect of fructose, glucose and lactate on the respiration 



of washed ram spermatozoa 53 



11 Increase of non-protein nitrogen and amino-nitrogen 



content in human semen on incubation at 37° 112 



12 Post-castrate fall and testosterone-induced rise of seminal 



fructose in rabbit 140 



13 Dosage-response curves of testosterone propionate, using 



the coagulating glands of the rat 141 



14 Effect of alloxan diabetes and insulin on seminal fructose 



in rabbit 147 



15 Diagrammatic representation of fructolysis in semen 156 



16 Effect of ergothioneine on boar spermatozoa 177 



xu 



