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Updated: June 8, 2025
But it would be superfluous to discuss this question in detail: for with plants we have conclusive evidence that the sterility of crossed species must be due to some principle, quite independent of natural selection.
Now, these cases are extremely rare, and may there fore be considered as exceptions or as real monstrosities. As the causes of sterility in women are numerous and of various kinds, we shall briefly enumerate them. The absence of ovaries or their deceased state are the radical cause of sterility. These causes may be suspected but not cured.
The people are also more scattered, and even poorer than they are on the Italian side of the Alps. Then the climate is much more severe, from the greater elevation of the sites of most of the Vaudois villages; so that when pastors were induced to settle there, the cold, and sterility, and want of domestic accommodation, soon drove them away.
I may here remind the reader that the sterility of species when crossed is not a specially-acquired quality, but, like the incapacity of certain trees to be grafted together, is incidental on other acquired differences.
The change from barrenness and sterility to richness and verdure was sudden and striking, and nothing certainly could have been more cheering or cheerful than our first camp on the Darling River. The scene itself was very pretty. Beautiful and drooping trees shaded its banks, and the grass in its channel was green to the water's edge.
"Yes, I see, dear; it's about half-way between," Aunt Juicy had hazarded in earlier years. No; truth, being alive, was not half-way between anything. It was only to be found by continuous excursions into either realm, and though proportion is the final secret, to espouse it at the outset is to insure sterility.
Here we beheld the ten thousand fair waving palms, which cover the green bosom of The Wady, a paradise encircled with ridges and outlines of the most frightful sterility. We now mounted our camels, for it was necessary to face also this new desert.
Is it not the ambition of kings and of the great, their negligence, their vices, their oppression, to which are generally due sterility, mendacity, wars, contagions, bad morals, and all the multiplied scourges which desolate the earth?
Its sterility and bleak and forbidding appearance, from all the accounts published respecting it, are scarcely equalled, certainly are not surpassed, in the most inhospitable countries near the North Pole; while ships are suddenly exposed to most violent storms, from which there is little chance of escaping, and in which, during one of the seal-catching seasons, a great number were lost.
When we see how capricious and uncertain this sterility is, how unknown the conditions on which it depends, I say that we have no right to affirm that those conditions will not be better understood by and by, and we have no ground for supposing that we may not be able to experiment so as to obtain that crucial result which I mentioned just now. So that though Mr.
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