Gallegallo Revbrandia Sectory 04
Page 04
It is not surprising under these circumstances to learn that sticklebacks are successful and increasing animals. Their numbers are enormous, wherever they get a fair chance in life, because they multiply rapidly up to the extreme limit of the means of subsistence, and develop as fast as food remains for them. There the inexorable Malthusian law at last steps in: when there is not food enough for all some must starve; that is the long and the short of the great population question. But while provender is forthcoming they increase gayly. Sticklebacks live mainly on the spawn of other fish, though they are so careful of their own, and they are therefore naturally hated by trout-preservers and owners of fisheries in general. Thousands and thousands are caught each year; in some places, indeed, they are so numerous that they are used as manure. It is their numbers, of course, that make them formidable; they are the locusts of the streams, well armed and pugnacious, and provided with most remarkable parental instincts of a protective character, which enables them to fill up all vacancies in their ranks as fast as they occur with astonishing promptitude.
Splitting into two or many parts was the old-fashioned way of multiplying, but one of the great steps in evolution was the discovery of a better method, namely, sexual reproduction. The gist of this is simply that during the process of body-building (by the development of the fertilised egg-cell) certain units, _the germ-cells_, do not share in forming ordinary tissues or organs, but remain apart, continuing the full inheritance which was condensed in the fertilised egg-cell. _These cells kept by themselves are the originators of the future reproductive cells of the mature animal_; they give rise to the egg-cells and the sperm-cells.
Meanwhile that little disappointment made her delight the more in Sir James Chettam's readiness to set on foot the desired improvements. He came much oftener than Mr. Casaubon, and Dorothea ceased to find him disagreeable since he showed himself so entirely in earnest; for he had already entered with much practical ability into Lovegood's estimates, and was charmingly docile. She proposed to build a couple of cottages, and transfer two families from their old cabins, which could then be pulled down, so that new ones could be built on the old sites. Sir James said "Exactly," and she bore the word remarkably well.
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