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If fertilized, it passes into the womb where the young develops through the embryonic stages, being supplied with nourishment and oxygen directly by the mother. In the bird, the egg, fertilized or unfertilized, passes out of the body and, being of conspicuous size, is readily observed.
Thus, as a general average, phosphorus increased the crop values by $76.50 an acre, which amounts to more than 300 per cent on the investment, and at the end of the ten years the soil on the best treated and highest yielding land was 10 per cent richer in phosphorus than at the beginning; while the crops from the unfertilized land removed an amount of phosphorus equal to nearly one-tenth of the total supply in the plowed soil.
There is only one more step to be taken in the modus operandi of reproduction, and that is in the higher mammal, where the ovum passes down through a slender oviduct into an enlarged chamber or womb, where it remains a certain length of time, finally if unfertilized, to pass away unnoticed; if fertilized, to develop into a young animal which in time will be born helpless and dependent upon the love and care of the mother.
The difference of appearance between fertilized and unfertilized ova treated by the method will demonstrate its utility. Whoever does not trust to the method for the evidence of death of the eggs until after five weeks subsequent to impregnation, must of course wait. Director Tiefenthaler, of Koelzen, has had the kindness to test the method practically, and finds it useful to fish culturists.
It was newly hatched, its sleek body still wet with the humors of incubation wet as a soaked mouse. Its abdomen, too, seemed enormous, all swelled and distended with unfertilized eggs. No, there could be no question concerning the sex of the thing; this was a female, and her tumefied body was almost bursting with eggs. In startling design the yellow skull stood out; the ribs of the skeleton.
It was virgin as the soil of the moorland a soil as yet untamed and unfertilized by the labour of man. And this effect of virginity, even though a trifle farouche, harsh, and barren in the perfection of its purity, appealed to Damaris' present mood. Her spirit leapt to meet it in proud fellowship. For it routed forebodings. Discounted introspective broodings.
Many of our common wild flowers, as perfectly and effectually planned for cross-fertilization as the orchids, do retain the reserve power of final self-fertilization if unfertilized by foreign pollen.
It is a good fact that 1218 bushels of wheat were produced by the application of nitrogen to an acre of land during a period of sixty years, over and above the produce of another acre which differed only by not receiving nitrogen; whereas the total produce from an acre of unfertilized land was only 756 bushels during the same sixty years.
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