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.
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.