Heeding neither squib, satire, nor sermon, Darwin, in the quiet of his Kentish home, went on rearranging old materials, collecting new materials, and verifying both, the outcome of this being his works on the Fertilization of Orchids and the Variation of Plants and Animals under Domestication, published in 1862 and 1867 respectively. Between these dates Huxley's Man's Place in Nature--logical supplement to the Origin of Species--appeared. But of this more anon. Meanwhile, as already named, Mr. Patrick Matthew had in the Gardener's Chronicle of 7th April, 1860, drawn attention to an appendix to his book on Naval Timber and Arboriculture published in 1831, in which he anticipated Darwin and Wallace's theory as follows: "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 pre-occupied, 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 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" (pp. 384, 385). While speaking of difficulty in understanding some passages in Mr. Matthew's appendix, Darwin says that "the full force of the principle of natural selection" is there, and, in referring to it in a letter to Lyell, he adds that "one may be excused in not having discovered the fact in a work on Naval Timber!"