This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1906 Excerpt: ...that she possesses it. But if it is so, that is no
evidence that the ovum from which she is derived requires more
nourishment for its development. Again, the greater difficulty
experienced in rearing male than female children is attributed by
some observers to the better nourished condition in which girls are
born; and many have argued, in one form or another, this is clear
evidence that the mother needs an extra supply of nourishment to
enable her to produce a girl. So far as this latter point is
concerned perhaps the greater mortality among male infants is
otherwise to be explained. But however this may be the point at
issue is not affected thereby, for if nutriment has any effect at
all upon the proportion of the sexes produced, it must be exerted
on the ovum in the ovary; that is to say it is the capacity of the
mother to supply the ovary with nutriment which must be taken into
consideration. Now it does not at all follow that a female with
exceptional powers of assimilating and of storing nutriment, or
that a mother especially capable of producing well-nourished
offspring, gives birth to an excess of females; indeed my own
experiments indicate that the reverse, in many cases, is true. At
the same time there are records of experiments which may, in my
opinion, be interpreted to show that nutrition has a selective
action on ovarian ova; it is on these lines I have myself been
working, not without success; and I hold that either quantitatively
or, more probably, qualitatively this is true. Of the various other
agencies which it is claimed affect the proportion of the sexes
born, such as in-breeding, cross-breeding, age, climate,
temperature, &c.; such power as they have, and I think there is
sufficient evidence to show they are potent agencies, must b...
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