It is not the heat of weather which produces this phenomenon, for if this were the case, it would appear in July and August rather than in April and May: but it is _the return of early warmth_. Perhaps this phenomenon also arises from influences now unknown, which would contribute in early spring to the vernal resurrection of organized beings. The slight variations in the period of heat in men, in different climates, confirms what has been said as to the action of spring. Villermé having compared the different parts of France, of Europe and even of the two hemispheres, found that the maximum of conceptions is, like this season, more precocious in warm than in cold climates. There is then a period of the year when man is more disposed to indulge in these excesses and when his desires should be more carefully controlled. We have already seen that Wichmann regards the spring as a cause why diurnal pollutions are more active and frequent; the same may be said of nymphomania. In a female whose history has already been given and who was affected with this disease, the period of the greatest degree of salacity extended from the beginning to the end of this season. There is another observation which at first seems only of a moderate degree of importance but which may present practical deductions of great interest. Villermé has found that the maximum and minimum of conceptions are much less marked in the cities than in the country, and still less so in the large cities. This fact confirms our remarks on the influence of seasons, for it shows that this influence is less, the more individuals are exposed to it. It shows too how far the salacity of men may be influenced by his mode of living. This remark has long been made in regard to animals: the period of rutting ceases to be marked periodically when they pass from a savage to a domestic state. We have now to learn in what manner a retired life acts on the venereal sense. Another observation of M. Villermé seems to us to throw light on this topic.