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The Descent of Man

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age in one species <strong>of</strong> the family, and likewise<br />

common to both sexes in this one species alone.<br />

In several kinds <strong>of</strong> antelopes, only the males are<br />

provided with horns, whilst in the greater<br />

number both sexes bear horns. With respect to<br />

the period <strong>of</strong> development, Mr. Blyth informs<br />

me that there was at one time in the Zoological<br />

Gardens a young koodoo (Ant. strepsiceros), <strong>of</strong><br />

which the males alone are horned, and also the<br />

young <strong>of</strong> a closely-allied species, the eland<br />

(Ant. oreas), in which both sexes are horned.<br />

Now it is in strict conformity with our rule, that<br />

in the young male koodoo, although ten<br />

months old, the horns were remarkably small,<br />

considering the size ultimately attained by<br />

them; whilst in the young male eland, although<br />

only three months old, the horns were already<br />

very much larger than in the koodoo. It is also a<br />

noticeable fact that in the prong-horned antelope<br />

(40. Antilocapra Americana. I have to thank<br />

Dr. Canfield for information with respect to the

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