The evidence above set forth, and much more for which I cannot here find space, seems conclusively to establish the fact that, throughout the civilized world, the pleasantest seasons of the year are most conducive to suicide. The question then arises, Does this rule hold good if applied to the pleasantest days of the pleasantest seasons? In other words, is the tendency to suicide greater on clear, dry, and sunny days in June than on dark, cloudy, and rainy days in June? Professor Edwin G. Dexter, of the University of Illinois, published in the _Popular Science Monthly_, in April, 1901, a long and interesting paper entitled "Suicide and the Weather," in which he gave the result of a comparison between the police records of 1,962 cases of suicide in the city of New York and the records of the New York Weather Bureau for all the days on which these suicides occurred. His comparisons and computations, which seem to have been made with great thoroughness and care, show not only that the tendency to suicide is greatest in the spring and summer months, but that it is most marked on the clearest, sunniest, and pleasantest days of those months. To state his conclusions in his own words: "The clear, dry days show the greatest number of suicides, and the wet, partly cloudy days the least; and with differences too great to be attributed to accident or chance. In fact, there are thirty-one per cent. more suicides on dry than on wet days, and twenty-one per cent. more on clear days than on days that are partly cloudy." It thus appears that, as a rule, the tendency to suicide, throughout the civilized world, is greatest in the pleasantest seasons of the year; that it is everywhere greatest in the pleasantest month of the pleasantest season; and that in New York City it is greatest on the clearest and sunniest days of the pleasantest month. From the point of view of science, therefore, it is perfectly reasonable and absolutely accurate to say on a beautiful, sunny day in early June, "This is regular suicide weather." Now, what is the explanation of this world-wide tendency to self-destruction in the seasons, months, and days when life would seem to be best worth living? The cause, whatever it be, can have no connection with race, religion, history, political status, or geographical location, because it acts uniformly among peoples as widely different, in all these respects, as the Russians, the Italians, the Americans, and the Japanese. It is evidently a cosmic cause, but what is its nature?