The epididymis has great significance in the reproductive biology of the male and it is gaining recognition as an organ worthy of study in its own right - where the secretory and absorptive activities of one tissue (the epithelium) profoundly modify the function of another (the spermatozoon). Apart from cases of epididymal agenesis or physical blockage, however, it is not yet known to what extent mal functions of the epididymis contribute to "unexplained" male infer tility, but its importance as a target for antifertility agents in the male is now widely appreciated. This monograph evolved...