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Also the foresight and prevention, that there be no likely or fit head, whereunto discontented persons may resort, and under whom they may join, is a known, but an excellent point of caution. I understand a fit head, to be one that hath greatness and reputation; that hath confidence with the discontented party, and upon whom they turn their eyes; and that is thought discontented, in his own particular: which kind of persons, are either to be won, and reconciled to the state, and that in a fast and true manner; or to be fronted with some other, of the same party, that may oppose them, and so divide the reputation. Generally, the dividing and breaking, of all factions and combinations that are adverse to the state, and setting them at distance, or at least distrust, amongst themselves, is not one of the worst remedies. For it is a desperate case, if those that hold with the proceeding of the state, be full of discord and faction, and those that are against it, be entire and united.

_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.

I spent a pleasant Christmas in Iquitos, all the English residents there showing me the greatest kindness. From Iquitos the river was no longer navigable for ocean-going steamers, and it was necessary to travel by small launches. There was no regular service, but there were a number of trading launches which went a certain distance up the river in order to trade with the different houses on the banks of the stream. The travelling was not particularly rapid, as one stopped ten or twenty times a day, and wasted endless time while the people came on board to buy beer or rum, or cotton goods, looking-glasses, etc., etc. Rubber and aigrettes, as well as money, were given in exchange for the goods received.

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