DIAGRAMS
 CHART I.—The Monthly Ecbolic Curve.
 CHART II.—The Annual Curve of the Conception-rate in Europe.
 CHART III.—The Annual Ecbolic Curve.
 CHART IV.—Curve of the Annual Incidence of Insanity in London.
 CHART V.—Curve of the Annual Incidence of General Paralysis in Paris (Garnier).
 CHART VI.—The Suicide-rate in London.
 CHART VII.
 CHART VIII.
 CHART IX.—Lunar-monthly Rhythm of Male Sexual Period.
 CHART X.—Curves of Lunar-monthly Rhythm as Smoothed by taking Pairs of Days.
 CHART XIa.—Weekly Rhythm of Male Sexual Period.
 CHART XIb.—Weekly Rhythm of Male Sexual Period.
 CHART XII.—Weekly Rhythm of Male Sexual Period.
 CHART XIII.—Joint Weekly Rhythm of Male Sexual Period, years 1886, 1887, 1888, 1892, 1893, 1894, 1895, 1896, 1897 combined.
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