“The self-regulating adaptive disposition of organised life may, in part, be traced to the extreme fecundity of nature, who, as before stated, has in all the varieties of her offspring a prolific power much beyond (in many cases a thousandfold) what is necessary to fill up the vacancies caused by senile decay. As the field of existence is limited and preoccupied, it is only the hardier, more robust, better suited to circumstance individuals, who are able to struggle forward to maturity, these inhabiting only the situations to which they have superior adaptation and greater power of occupancy than any other kind; the weaker and less circumstance-suited being prematurely destroyed. This principle is in constant action; it regulates the colour, the figure, the capacities, and instincts; those individuals in each species whose colour and covering are best suited to concealment or protection from enemies, or defence from inclemencies or vicissitudes of climate, whose figure is best accommodated to health, strength, defence, and support; whose capacities and instincts can best regulate the physical energies to self-advantage according to circumstances—in such immense waste of primary and youthful life those only come forward to maturity from _the strict ordeal by which nature tests their adaptation to her standard of perfection_ and fitness to continue their kind by reproduction.” {86a} A little lower down Mr. Matthew speaks of animals under domestication “_not having undergone selection by the law of nature_, _of which we have spoken_, and hence being unable to maintain their ground without culture and protection.” The distinction between Darwinism and Neo-Darwinism is generally believed to lie in the adoption of a theory of natural selection by the younger Darwin and its non-adoption by the elder. This is true in so far as that the elder Darwin does not use the words “natural selection,” while the younger does, but it is not true otherwise. Both writers agree that offspring tends to inherit modifications that have been effected, from whatever cause, in parents; both hold that the best adapted to their surroundings live longest and leave most offspring; both, therefore, hold that favourable modifications will tend to be preserved and intensified in the course of many generations, and that this leads to divergence of type; but these opinions involve a theory of natural selection or quasi-selection, whether the words “natural selection” are used or not; indeed it is impossible to include wild species in any theory of descent with modification without implying a quasi-selective power on the part of nature; but even with Mr. Charles Darwin the power is only quasi-selective; there is no conscious choice, and hence there is nothing that can in strictness be called selection.