This curve, as ascertained for one case, is interesting on account of the
close relationship between sexual and vesical activity. After a minimum
point in autumn there is a rise through the early part of the year to a
height maintained through spring and summer, and reaching its maximum in
August.[171] This may be said to correspond with the general tendency
found in some cases of nocturnal seminal emissions from a winter minimum
to an autumn maximum.
There is an annual curve in voluntary muscle strength. Thus in Antwerp,
where the scientific study of children is systematically carried out by a
Pedological Bureau, Schuyten found that, measured by the dynamometer, both
at the ages of 8 and 9, both boys and girls showed a gradual increase of
strength from October to January, a fall from January to March and a rise
to June or July. March was the weakest month, June and July the
strongest.[172]
Schuyten also found an annual curve for mental ability, as tested by power
of attention, which for much of the year corresponded to the curve of
muscular strength, being high during the cold winter months. Lobsien, at
Kiel, seeking to test Schuyten's results and adopting a different method
so as to gauge memory as well as attention, came to conclusions which
confirmed those of Schuyten. He found a very marked increase of ability in
December and January, with a fall in April; April and May were the
minimum months, while July and October also stood low.
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