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The Descent of Man

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y for the fertilisation <strong>of</strong> the female; and the<br />

males accordingly largely preponderate, but it<br />

is by no means obvious how this maleproducing<br />

tendency could have been acquired.<br />

I formerly thought that when a tendency to<br />

produce the two sexes in equal numbers was<br />

advantageous to the species, it would follow<br />

from natural selection, but I now see that the<br />

whole problem is so intricate that it is safer to<br />

leave its solution for the future.<br />

CHAPTER IX.<br />

SECONDARY SEXUAL CHARACTERS IN<br />

THE LOWER CLASSES OF THE ANIMAL<br />

KINGDOM.<br />

<strong>The</strong>se characters absent in the lowest classes—<br />

Brilliant colours—Mollusca —Annelids—<br />

Crustacea, secondary sexual characters strongly<br />

developed; dimorphism; colour; characters not

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