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The Descent of Man

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quired under domestication, are regularly<br />

transmitted to the same sex. As a rule, it is the<br />

females alone in cats which are tortoise-shell,<br />

the corresponding colour in the males being<br />

rusty-red. With most breeds <strong>of</strong> the fowl, the<br />

characters proper to each sex are transmitted to<br />

the same sex alone. So general is this form <strong>of</strong><br />

transmission that it is an anomaly when variations<br />

in certain breeds are transmitted equally<br />

to both sexes. <strong>The</strong>re are also certain sub-breeds<br />

<strong>of</strong> the fowl in which the males can hardly be<br />

distinguished from one another, whilst the females<br />

differ considerably in colour. <strong>The</strong> sexes<br />

<strong>of</strong> the pigeon in the parent-species do not differ<br />

in any external character; nevertheless, in certain<br />

domesticated breeds the male is coloured<br />

differently from the female. (36. Dr. Chapuis,<br />

'Le Pigeon Voyageur Belge,' 1865, p. 87. Boitard<br />

et Corbie, 'Les Pigeons de Voliere,' etc., 1824, p.<br />

173. See, also, on similar differences in certain<br />

breeds at Modena, 'Le variazioni dei Colombi<br />

domestici,' del Paolo Bonizzi, 1873.) <strong>The</strong> wattle

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