“However various and contradictory the different theories of generation, almost all physiologists are agreed, that the entrance of the sperm itself (or of some volatile particles proceeding from it) into the uterus, must precede conception. This it was that probably first suggested the possibility of preventing conception at all.” The eloquent writer, who was at that time unaware of the existence of Desomeaux’s mode of prevention to conception,[39] states the same result was attained by a complete withdrawal on the part of the male previous to emission. But this mode, it will be readily perceived, is attended with, to some, insurmountable difficulties. In the first place, few men can invariably control themselves in this respect, and to be an effectual preventive, he must ever, and invariably control his passions. Now it cannot be denied, that even those who habitually can, and do control themselves, will inevitably, now and then, in so exciting a passion, lose their self-control. It is impossible to do otherwise. And one moment’s forgetfulness defeats the end. In the second place, even if always and invariably practicable, it makes the act of coition incomplete and unsatisfactory. In the third place it would be almost, nay quite impossible, to prevent an imperceptible and unconscious escape of semen, sufficient however to produce conception, often giving rise to unjust and unfounded suspicions, when, in fact, the cause for the existence of pregnancy is the same as though no withdrawal was practised. And lastly, its effects upon the constitution are frequently not unlike those produced by onanism. In addition to which, it is unsafe, because uncertain; consequently, when indispensable to prevent pregnancy, is of no avail, if not actually dangerous.[40] To sum up, in brief, why pregnancy should be prevented, the reasons adduced seem to be conclusive to the able and talented writer, in its moral, social, and physiological aspect. _Morally._ Firstly. It induces early marriages by removing the principal obstacle thereto, viz.: the fear of having offspring before the parents are in a pecuniary condition to support, rear, and educate them. And, Secondly, By inducing early marriages, seductions would become less frequent, and consequently prostitution, comparatively, become extinct. _Socially._ Firstly. Young men, instead of seeking excitement and amusement in the intoxicating cup, gaming, night carousals, brothels, &c., acquiring habits of dissipation deadening alike to the keen, fresh susceptibilities belonging to youth—habits too, which often cling to them in after life, habits which, perhaps for ever destroy their health,—as tainting their constitution with some foul and incurable disease,—would, with a view to early marriage, cultivate the social and domestic ties, while yet pure and uncontaminated by contact with the dissolute and vicious. And