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And those tents, which they bring with them, when they have sufficiently hunted and fished, they remove to other places; and when they have sufficiently stored them of such victuals as the country yieldeth, or bringeth forth, they return to their winter stations or habitations. This conjecture do I make for the infertility which I perceive to be in that country.
We fully agree with the general tenor of this weighty passage; but forcible as are these arguments, and little as the value of fertility or infertility as a test of species may be, it must not be forgotten that the really important fact, so far as the inquiry into the origin of species goes, is, that there are such things in Nature as groups of animals and of plants, whose members are incapable of fertile union with those of other groups; and that there are such things as hybrids, which are absolutely sterile when crossed with other hybrids.
From the great difficulty of ascertaining the infertility of varieties in a state of nature, for a supposed variety, if proved to be infertile in any degree, would almost universally be ranked as a species; from man attending only to external characters in his domestic varieties, and from such varieties not having been exposed for very long periods to uniform conditions of life; from these several considerations we may conclude that fertility does not constitute a fundamental distinction between varieties and species when crossed.
One spring there came to Grand Pré a young Englishman named Desbra, a long-limbed, ample-chested youth, with whitish hair and ruddy skin, and clear, straightforward blue eyes. Desbra was resolved to learn farming in a new country, so he bought an old farm on the uplands, with an exhausted orchard, and was for a time surprised at the infertility of the soil.
Of course no one who knows you or who takes a general view of your results will say this, but I daresay it will be said. I am afraid this book will not do much or anything to get rid of the one great objection, that the physiological characteristic of species, the infertility of hybrids, has not yet been produced.
It is natural to suppose that as they were childless, there may have existed a moral equivalent to this infertility; but also, with a man such as we know Duerer to have been, and a woman in every case not bad, have we not reason to expect that this moral barrenness which may have afflicted their union was in some large measure conquered by mutual effort and discipline, and bore from time to time those rarer flowers whose beauty and sweetness repay the conscious culture of the soul?
But sooner or later, as every East End doctor knows, the ways of the social abyss lead to death, the premature death of the individual, or death through the death or infertility of the individual's stunted offspring, or death through that extinction which moral perversion involves. It is a recruited class, not a breeding multitude.
He would like to explain the Lupercalia as a popular play, representing the spirits of vegetation opposing the spirits of infertility.
But the one long poem which Coleridge contributed to the collection is alone sufficient to associate it for ever with his name. Unum sed leonem. To any one who should have taunted him with the comparative infertility of his Muse he might well have returned the haughty answer of the lioness in the fable, when he could point in justification of it to the Rime of the Ancient Marinere.
How far these experiments may be trusted, I know not; but the forms experimented on are ranked by Sagaret, who mainly founds his classification by the test of infertility, as varieties, and Naudin has come to the same conclusion.
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