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The Descent of Man

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markable how very closely he suggested the<br />

right method <strong>of</strong> procedure.")<br />

ON THE RELATION BETWEEN THE PE-<br />

RIOD OF DEVELOPMENT OF A CHARAC-<br />

TER AND ITS TRANSMISSION TO ONE SEX<br />

OR TO BOTH SEXES.<br />

Why certain characters should be inherited by<br />

both sexes, and other characters by one sex alone,<br />

namely by that sex in which the character<br />

first appeared, is in most cases quite unknown.<br />

We cannot even conjecture why with certain<br />

sub-breeds <strong>of</strong> the pigeon, black striae, though<br />

transmitted through the female, should be developed<br />

in the male alone, whilst every other<br />

character is equally transferred to both sexes.<br />

Why, again, with cats, the tortoise-shell colour<br />

should, with rare exceptions, be developed in<br />

the female alone. <strong>The</strong> very same character, such<br />

as deficient or supernumerary digits, colourblindness,<br />

etc., may with mankind be inherited

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