The Power That Preserves | My Web Site Page 204 Chapter 02 Page 04

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Once in a generation, a Wallace may be found physically, mentally, and morally qualified to wander unscathed through the tropical wilds of America and of Asia, to form magnificent collections as he wanders, and withal to think out sagaciously the conclusions suggested by his collections; but, to the ordinary explorer or collector, the dense forests of equatorial Asia and Africa, which constitute the favorite habitation of the Orang, the Chimpanzee, and the Gorilla, present difficulties of no ordinary magnitude; and the man who risks his life by even a short visit to the malarious shores of those regions may well be excused if he shrinks from facing the dangers of the interior; if he contents himself with stimulating the industry of the better-seasoned natives, and collecting and collating the more or less mythical reports and traditions with which they are too ready to supply him.

The foreign dominions of Rome now comprised the ten following provinces, to which is added the date of the formation of each: 1. Sicily, B.C. 241. 2. Sardinia and Corsica, B.C. 238. 3, 4. The two Spains, Citerior and Ulterior, B.C. 205. 5. Gallia Cisalpina, B.C. 191. 6. Macedonia, B.C. 146. 7. Illyricum, probably formed at the same time as Macedonia. 8. Achaia, that is, Southern Greece, virtually a province after the capture of Corinth, B.C. 146, though the exact date of its formation is unknown. 9. Africa, consisting of the dominions of Carthage, B.C. 146. 10. Asia, including the kingdom of Pergamus, B.C. 129. To these an eleventh was added in B.C. 118 by the conquest of the southern portion of Transalpine Gaul between the Alps and the Pyrenees. In contrast with the other portions of Gaul, it was frequently called simply the "Provincia," a name which has been retained in the modern Provence.

_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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