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The Descent of Man

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mediately pressed closely by a male on each<br />

side; and when they have been in that situation<br />

for a time, are superseded by other two males."<br />

(73. Yarrell, 'Hist. British Fishes,' vol. i. 1826, p.<br />

307; on the Cyprinus carpio, p. 331; on the Tinca<br />

vulgaris, p. 331; on the Abramis brama, p.<br />

336. See, for the minnow (Leuciscus phoxinus),<br />

'Loudon's Magazine <strong>of</strong> Natural History,' vol. v.<br />

1832, p. 682.)<br />

INSECTS.<br />

In this great Class, the Lepidoptera almost alone<br />

afford means for judging <strong>of</strong> the proportional<br />

numbers <strong>of</strong> the sexes; for they have been collected<br />

with special care by many good observers,<br />

and have been largely bred from the egg or<br />

caterpillar state. I had hoped that some breeders<br />

<strong>of</strong> silk-moths might have kept an exact<br />

record, but after writing to France and Italy,<br />

and consulting various treatises, I cannot find<br />

that this has ever been done. <strong>The</strong> general opi-

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