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Updated: May 10, 2025
As those areas were fertile and likely to attract raiding squadrons, so the great routes were infertile, and no enemy could afford to spend squadrons upon them. It is obvious, however, that the system had its weak side, for the mere fact that a convoy was upon a great route tended to attract a squadron, and the comparative immunity of those routes was lost.
Darwin, in order to place his views beyond the reach of all possible assault, ought to be able to demonstrate the possibility of developing from a particular stock by selective breeding, two forms, which should either be unable to cross one with another, or whose cross-bred offspring should be infertile with one another.
The Cimbri and Teutones the tribes defeated by Marius; Ariovistus, who was defeated by Julius Caesar; the Goths and the Visi-Goths; the Franks and the Saxons; all have poured forth from this infertile country, for the conquest of other lands. The Germans of to-day express this longing of the North Germans for pleasanter climes in the phrase in which they demand "a place in the sun."
One May day we started a meadowlark from her nest. There were three just hatched young in the nest, and one egg lying on the ground about two inches from the nest. I suspected that this egg was infertile and that the bird had had the sense to throw it out, but on examination it was found to contain a nearly grown bird.
They were distant from transportation lines and markets; they employed poor farming methods; they had no fertilizers; they raised no staple crops on their infertile land; and in addition they now had to face the destitution that follows fighting. Yet these regions had formerly been almost self-supporting, although the farms were small and no elaborate labor system had been developed.
Francis Galton says: "We know, and may guess something more, of the reason why this marvellously gifted race declined. Social morality grew exceedingly lax; marriage became unfashionable and was avoided; many of the more ambitious and accomplished women were avowed courtesans, and consequently infertile; and the mothers of the incoming population were of a heterogeneous class."
Darwin, in order to place his views beyond the reach of all possible assault, ought to be able to demonstrate the possibility of developing from a particular stock by selective breeding, two forms, which should either be unable to cross one with another, or whose cross-bred offspring should be infertile with one another.
Thus did cultivation, driven out, leave the East, and perhaps the deserts formerly robbed of their coverings; like the wild hordes of old over beautiful Greece, thus rolls this conquest with fearful rapidity from East to West through America; and the planter now often leaves the already exhausted land, and the eastern climate, become infertile through the demolition of the forests, to introduce a similar revolution into the Far West."
Unless the proportion of these latter ingredients is so large as to create a considerable adhesiveness in the mass in which case it can no longer properly be called sand it is infertile, and, if not charged with water, partially agglutinated by iron, lime, or other cement, or confined by alluvion resting upon it, it is much inclined to drift, whenever, by any chance, the vegetable network which, in most cases, thinly clothes and at the same time confines it, is broken.
But there happens to be a tolerably clear proof that such changes as the evolution of complicated structures and habits and social instincts can take place independently of use-inheritance. Working bees, being infertile "neuters," cannot as a rule transmit their own modifications and habits.
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