You Cannot Get Away | My Web Site Page 205 Chapter 02 Page 04

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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.

At first Dutch art was influenced, even confounded, with that of Flanders. The Van Eycks led the way, and painters like Bouts and others, though Dutch by birth, became Flemish by adoption in their art at least. When the Flemish painters fell to copying Italy some of the Dutch followed them, but with no great enthusiasm. Suddenly, at the beginning of the seventeenth century, when Holland had gained political independence, Dutch art struck off by itself, became original, became famous. It pictured native life with verve, skill, keenness of insight, and fine pictorial view. Limited it was; it never soared like Italian art, never became universal or world-embracing. It was distinct, individual, national, something that spoke for Holland, but little beyond it.

_Natural selection_ depends on the same three factors as _artificial selection_: on _variability_, _inheritance_, and _selection for breeding_, but this last is here carried out not by a breeder but by what Darwin called the "struggle for existence." This last factor is one of the special features of the Darwinian conception of nature. That there are carnivorous animals which take heavy toll in every generation of the progeny of the animals on which they prey, and that there are herbivores which decimate the plants in every generation had long been known, but it is only since Darwin's time that sufficient attention has been paid to the facts that, in addition to this regular destruction, there exists between the members of a species a keen competition for space and food, which limits multiplication, and that numerous individuals of each species perish because of unfavourable climatic conditions. The "struggle for existence," which Darwin regarded as taking the place of the human breeder in free nature, is not a direct struggle between carnivores and their prey, but is the assumed competition for survival between individuals _of the same_ species, of which, on an average, only those survive to reproduce which have the greatest power of resistance, while the others, less favourably constituted, perish early. This struggle is so keen, that, within a limited area, where the conditions of life have long remained unchanged, of every species, whatever be the degree of fertility, only two, _on an average_, of the descendants of each pair survive; the others succumb either to enemies, or to disadvantages of climate, or to accident. A high degree of fertility is thus not an indication of the special success of a species, but of the numerous dangers that have attended its evolution. Of the six young brought forth by a pair of elephants in the course of their lives only two survive in a given area; similarly, of the millions of eggs which two thread-worms leave behind them only two survive. It is thus possible to estimate the dangers which threaten a species by its ratio of elimination, or, since this cannot be done directly, by its fertility.

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