Semen, animalcules of the 11 Sexual Abuses 44 Sexual Desires 20 Sexual Enjoyment of Females 34 Sexual Feeling in Females 35 Sexual Indulgence 33 Sexual Indulgence, time for 36 Sexual Intercourse, too early 42 Sexual Intercourse, too frequent 22 Sexual Intercourse, enjoyment of 36 Sexual Intercourse, position at 46 Sexual Organs, Food to stimulate 37 Sexual Union 21-22 Sex of a Child, how determined 28 Testes, the 6 Temperaments, laws of the 50 Unborn Child, growth of the 32 Unborn Child, intellect of 48 Uterus, or Womb 16 Vagina, the 16 Vital Force, influence of 52 Wife, choice of a 48 Why Children look like Parents 30 Zoospermes 10 ENTERED ACCORDING TO ACT OF CONGRESS in the year 1859 by BENJAMIN H. DAY, in the Clerk’s Office of the United States District Court for the Southern District of New York. PREFACE. Within the past few years, numerous physiological books have been compiled and printed, ostensibly for popular reading and to impart certain information which could not be obtained except from very expensive medical works. On examination, nearly the whole of them prove to be the productions of persons calling themselves physicians, and issued as a medium of advertising their medicines, or their peculiar practice. In most of these books, facts in physiology are so mixed up with empirical self-laudations, absurd reasonings, useless repetitions, and fabulous cases in point, as to become not only intensely tedious, but in a measure disgusting to the reader. The Prevention of Conception appears to be one of the main features of these publications, and each author professes to have a secret plan of his own for that purpose, which he offers to impart for a professional fee of five dollars. An offer like this to intelligent people is understood as arrant quackery; but there are such a vast number of married persons who desire to limit the number of their offspring, that many will send their money in sheer desperation, and with little or no hope of success.