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Hints of the idea of Natural Selection have been detected elsewhere. James Watt,[32] for instance, has been reported as one of the anticipators (1851). But we need not prolong the inquiry further, since Darwin did not know of any anticipations until after he had published the immortal work of 1859, and since none of those who got hold of the idea made any use of it. What Darwin did was to follow the clue which Malthus gave him, to realise, first by genius and afterwards by patience, how the complex and subtle struggle for existence works out a natural selection of those organisms which vary in the direction of fitter adaptation to the conditions of their life. So much success attended his application of the Selection-formula that for a time he regarded Natural Selection as almost the sole factor in evolution, variations being pre-supposed; gradually, however, he came to recognise that there was some validity in the factors which had been emphasised by Lamarck and by Buffon, and in his well known summing up in the sixth edition of the _Origin_ he says of the transformation of species: "This has been effected chiefly through the natural selection of numerous successive, slight, favourable variations; aided in an important manner by the inherited effects of the use and disuse of parts; and in an unimportant manner, that is, in relation to adaptive structures, whether past or present, by the direct action of external conditions, and by variations which seem to us in our ignorance to arise spontaneously."

During his absence from Rome Caesar went to Rhodes, where his former preceptor resided, and he continued to pursue there for some time his former studies. He looked forward still to appearing one day in the Roman Forum. In fact, he began to receive messages from his friends at home that they thought it would be safe for him to return. Sylla had gradually withdrawn from power, and finally had died. The aristocratical party were indeed still in the ascendency, but the party of Marius had begun to recover a little from the total overthrow with which Sylla's return, and his terrible military vengeance, had overwhelmed them. Caesar himself, therefore, they thought, might, with prudent management, be safe in returning to Rome.

Of Mr. Patrick Matthew, who buried his treasure in an appendix to a work on _Naval Timber and Arboriculture_, Darwin said that "he clearly saw the full force of the principle of natural selection." In 1860 Darwin wrote--very characteristically--about this to Lyell: "Mr. Patrick Matthew publishes a long extract from his work on _Naval Timber and Arboriculture_, published in 1831, in which he briefly but completely anticipates the theory of Natural Selection. I have ordered the book, as some passages are rather obscure, but it is certainly, I think, a complete but not developed anticipation. Erasmus always said that surely this would be shown to be the case some day. Anyhow, one may be excused in not having discovered the fact in a work on Naval Timber."[30]

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