Volume 60: William Campbell letters, 1846-1894: No. 216
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breeding from pure males, is a most important and a most interesting one
question. I well recollect that the pure flock were finer; but the fact of their always having had a pick of the best of the rams must also be taken into account. And it is a fair question to put, whether, had the cross bred sheep had the same advantages in equal sires for so many generations would there have been any appreciable difference in their progeny. Another question may be fairly put - are not all sheep sprung originally from the same parent: and has not the different varieties been produced from a difference in food, in climate and in treatment.
My observations lead me to the conclusion that on the warm plains