Mania comes to a crisis in spring, said the old physician, Aretæus (Bk. 1, Ch. V).
This is, at all events, the case in France, Prussia, and Italy. See, for instance, Durkheim's discussion of the cosmic factors of suicide, Le Suicide, 1897, Chapter III. In Spain, as Bernaldo de Quirós shows (Criminologia, p. 69), there is a slight irregular rise in December, but otherwise the curve is perfectly regular, with maximum in June, and minimum in January.
This holds good of a south European country, taken separately. A chart of the annual incidence of suicide by hanging, in Roumania, presented by Minovici (Archives d'Anthropologie Criminelle, 1905, p. 587), shows climaxes of equal height in May and September.