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Origin of Species by Thomas Henry Huxley
page 14 of 45 (31%)
Ancon ram in his place. The result justified their sagacious
anticipations, and coincided very nearly with what occurred to the
progeny of Gratio Kelleia. The young lambs were almost always either
pure Ancons, or pure ordinary sheep.* But when sufficient Ancon sheep
were obtained to interbreed with one another, it was found that the
offspring was always pure Ancon. Colonel Humphreys, in fact, states
that he was acquainted with only "one questionable case of a contrary
nature." Here, then, is a remarkable and well-established instance,
not only of a very distinct race being established 'per saltum', but of
that race breeding "true" at once, and showing no mixed forms, even
when crossed with another breed.

[footnote] *Colonel Humphreys' statements are exceedingly
explicit on this point:--"When an Ancon ewe is impregnated
by a common ram, the increase resembles wholly either the
ewe or the ram. The increase of the common ewe impregnated
by an Ancon ram follows entirely the one or the other,
without blending any of the distinguishing and essential
peculiarities of both. Frequent instances have happened
where common ewes have had twins by Ancon rams, when one
exhibited the complete marks and features of the ewe, the
other of the ram. The contrast has been rendered
singularly striking, when one short-legged and one
long-legged lamb, produced at a birth, have been seen
sucking the dam at the same time."--'Philosophical
Transactions', 1813, Pt. I. pp. 89, 90.

By taking care to select Ancons of both sexes, for breeding from, it
thus became easy to establish an extremely well-marked race; so
peculiar that, even when herded with other sheep, it was noted that the
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