He soon, however, turned his attention to metaphysics and psychology, and for the North American Review and later for the National he wrote philosophical essays on the lines of Mill, Darwin and Spencer.
Empedocles tries to explain the genesis of organic beings, and, according to Lange, anticipates the idea of Darwin that adaptations abound, because it is their nature to perpetuate themselves.
The perception of the changes, or, in other words, the reception of the stimulus, is associated for example, with the tips of roots and the apices of stems. The first recognition of a specially receptive part was made by Charles Darwin, who identified the perception of stimulation with the tip of the young growing root.
Francis Darwin later demonstrated that the tips of the plumules of grasses were sensitive parts.
By Moor; Darwin and Acton, Practical Physiology of Plants; Davenport, C.B., Experimental Morphology, vols.
With regard to the causation of variation Darwin says (Origin of Species, ch.
As Darwin has pointed out, this response may be direct or indirect.
Sir George Darwin finds a possible explanation of these in the screwing motion which the earth would suffer in its plastic state.
Darwin doubted, however, whether they ought to be separated (Life, iii.
This was first suggested by Edward Forbes in I846, though the idea had earlier suggested itself to Darwin (Life, i.
Darwin thought that the migration southwards would always be preponderant (Origin of Species, 5th ed., 458).
Only exist, as Darwin has said, where they must, not where they can.
Darwin attributes this to the fact that the northern forms were the more powerful (Origin of Species, 5th ed., p.458).
The evolutionary theory, more than hinted at in Kant's " Physical Geography," has, since the writings of Charles Darwin, become the unifying principle in geography.
The - - study of tidal strain in the earth's crust by Sir George Darwin has led that physicist to indicate the possibility of the triangular form and southerly direction of the continents being a result of the differential or tidal attraction of the sun and moon.
For this he wrote the first adequate account in German of the Darwinian theory of natural selection, which drew a warm letter of appreciation from Darwin himself.
These stridulating organs were mentioned by C. Darwin as probable examples of the action of sexual selection; they are, however, frequently present in both sexes, and in some families also in the larvae.
These structures were believed by C. Darwin to be explicable by sexual selection.
Next to Stanley the most important place on East Falkland is Darwin on Choiseul Sound - a village of Scottish shepherds and a station of the Falkland Island Company.
The Falkland Islands Company, having its headquarters at Stanley and an important station in the camp at Darwin, carries on an extensive business in sheep-farming and the dependent industries, and in the general import trade.
The government maintains schools and travelling teachers; the Falkland Islands Company also maintains a school at Darwin, and there is one for those of the Roman Catholic faith in Stanley.
" Adventure" and " Beagle" (1839); Darwin, Voyage of a Naturalist round the World (1845); S.
Muller, Facts and Arguments for Darwin (trans.
That this was the case is undeniably shown by some remarks of Canon Tristram, who, in treating of the Alaudidae and Saxicolinae of Algeria (whence he had recently brought a large collection of specimens of his own making), stated (Ibis, 18 59, pp. 4 2 9-433) that he could " not help feeling convinced of the truth of the views set forth by Messrs Darwin and Wallace," adding that it was " hardly possible, I 'should think, to illustrate this theory better than by the larks and chats of North Africa."
To Darwin and those who believed with him scarcely any discovery could have been more welcome; but that is beside our present business.
Darwin, the naturalist, says of the inhabitants of Tierra del Fuego, that while his own party, who were well clothed and sitting close to a fire, were far from too warm, these naked savages, who were farther off, were observed, to his great surprise, "to be streaming with perspiration at undergoing such a roasting."