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      "Thursday, July 27, 1893. The peculiar feeling.

       (The diary notes that it was apparent at about 3 o'clock

       that afternoon. That night at 10 o'clock, X. had sexual

       intercourse, and the feeling was not noted the next day.)

      "Friday, September 8, 1893. The peculiar feeling.

       (Continued until Tuesday, the 11th, and then disappeared.

       No sexual intercourse, and no nightly emission.)

      "Wednesday, October 25, 1893. The peculiar feeling.

       (Continued until Saturday night, when there was a nightly

       emission.)

      "Saturday, December 9, 1893. The peculiar feeling.

       (Continued until Monday night, when there was sexual

       relations.)

      It will be noted that the intervals observed were of about six weeks' duration, excepting one, that from September to October, when it was nearly seven weeks.

      "These observations were not recorded after 1893. X. thinks that in 1894 the intervals were longer, an opinion which is based on the fact that for a period of six months he had no sexual intercourse and no nightly emissions. The times during this six months when he had the 'peculiar feeling,' the sensation was so slight as to be scarcely noted. In 1895, the feeling seemed more pronounced than ever before, and X. thinks that it may have recurred as often as once a month. In 1896, 1897, and 1898, the intervals, he thinks, lengthened—at times, he thought, wholly disappeared. During 1899, while they did not recur often, when they did come the sensation was pronounced, although the emission was less common. There was a peculiar 'heavy' feeling about the testicles, and a marked tendency towards erection of the penis, especially at night-time (while sleeping). X. often awoke to find a tense erection. Moreover, these feelings usually continued a week.

      "1. In general, X. is of the opinion that as he grows older these intervals lengthen, though this inference is not based on recorded data.

      "2. He notes that a discharge (through sexual intercourse or in sleep) invariably brings the peculiar feeling to a close for the time being.

      "3. He notes that sexual intercourse at the time stops it; but, when there has been sexual intercourse within a week or ten days of the time (based upon the observations of 1893), that it had no tendency to check the feeling."

      In another case, that of F. C., an Irish farmer, born in Waterford, the data are still more meagre, though the periodicity is stated to be very pronounced. He is chaste, steady, with occasional lapses from strict sobriety, healthy and mentally normal, living a regular open-air life, far from the artificial stimuli of towns. The observations refer to a period when he was from 20 to 27 years of age. During this period, nocturnal emissions occurred at regular intervals of exactly a month. They were ushered in by fits of irritability and depression, and usually occurred in dreamless sleep. The discharges were abundant and physically weakening, but they relieved the psychic symptoms, though they occasioned mental distress, since F. C. is scrupulous in a religious sense, and also apprehensive of bad constitutional effects, the result of reading alarmist quack pamphlets.

      In another case known to me, a young man leading a chaste life, experienced crises of sexual excitement every ten to fourteen days, the crisis lasting for several days.

      Finally, an interesting contribution to this subject, suggested by this Study, has been made and published (in the proceedings of the Amsterdam International Congress of Psychology, in 1907) by the well-known Amsterdam neurologist and psychologist, Dr. L. S. A. M. Von Römer under the title, "Ueber das Verhältniss zwischen Mondalter und Sexualität." Von Römer's data are made up not of nocturnal involuntary emissions, but of the voluntary acts of sexual intercourse of an unmarried man, during a period of four years. Von Römer believes that these, to a much greater extent than those of a married man, would be liable to periodic influence, if such exist. On making a curve of exact lunar length (similarly to Perry-Coste), he finds that there are, every month, two maxima and two minima, in a way that approximately resemble Perry-Coste's curve. The main point in Von Römer's results is, however, the correspondence that he finds with the actual lunar phases; the chief maximum occurs at the time of the full moon, and the secondary maximum at the time of the new moon, the minima being at the first and fourth quarters. He hazards no theory in explanation of this coincidence, but insists on the need for further observations. It will be seen that A. N.'s results (ante p. 117) seem in the main to correspond to Von Römer's.

      III.

       Table of Contents

      The Annual Sexual Rhythm—In Animals—In Man—Tendency of the Sexual Impulse to become Heightened in Spring and Autumn—The Prevalence of Seasonal Erotic Festivals—The Feast of Fools—The Easter and Midsummer Bonfires—The Seasonal Variations in Birthrate—The Causes of those Variations—The Typical Conception-rate Curve for Europe—The Seasonal Periodicity of Seminal Emissions During Sleep—Original Observations—Spring and Autumn the Chief Periods of Involuntary Sexual Excitement—The Seasonal Periodicity of Rapes—Of Outbreaks among Prisoners—The Seasonal Curves of Insanity and Suicide—The Growth of Children According to Season—The Annual Curve of Bread-consumption in Prisons—Seasonal Periodicity of Scarlet Fever—The Underlying Causes of these Seasonal Phenomena.

      That there

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