e monthly average was 3.43. I
reproduce the total results summated for the months, separately,
and I have worked out the daily average for each month, for
convenience counting the summated eight years as one year:--

Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec.
27 27 27 31 29 28 36 25 18 27 30 24
.87 .94 .87 1.03 .93 .93 1.16 .81 .60 .87 1.00 .77

Here, as in all the other curves we have been able to consider,
we may see the usual two points of climax in spring and in
autumn; the major climax covers April, May, June, and July, the
minor autumnal climax is confined to November. In the light of
the evidence which has thus accumulated, we may conclude that the
existence of an annual ecbolic curve, with its spring and autumn
climaxes, as described in the first edition of this book, is now
definitely established.

If we are to believe, as these records tend to show, that the nocturnal
and involuntary voice of the sexual impulse usually speaks at least as
loudly in autumn as in spring, we are confronted by a certain divergence
of the sleeping sexual impulse from the waking sexual instinct, as
witnessed by the conception-curve, and also, it may be added, by the
general voice of tradition, and, indeed, of individual feeling, which
concur, on the whole, in placing the chief epoch of sexual activity in
spring and early summer, more especially as regards women.[159] It is not
impossible to reconcile the contradiction, assuming it to be real, but I
will refrain here from suggesting the various explanations which arise.
We need a broader basis of facts.

There are many facts to show that early spring and, to a certain extent,
autumn are periods of visible excitement, mainly sexual in character. We
have already seen that among the Eskimo menstruation and sexual desire
occur chiefly in spring, but cases are known of healthy women in temperate
climes who only menstruate twice a year, and in such cases the menstrual
epochs appear to be usually in spring and autumn. Such, at all events, was
the case in a girl of 20, whose history has been recorded by Dr. Mary
Wenck, of Philadelphia.[160] She menstruated first when 15 years old. Six
months later the flow again appeared for the second time, and lasted three
weeks, without cessation. Since then, for five years, she menstruated
during March and September only, eac