. Darwinism : an exposition of the theory of natural selection, with some of its applications. Natural selection; Evolution. 224 DARWINISM will serve to illustrate this difference; which is frequently much greater and modified in an endless variety of Avays (Fig. 22). Numbers of species of pigeons, hawks, finches, warblers, ducks, and innumerable other birds possess this class of mark- ings ; and they correspond so exactly in general character with. Cursorius chalcopterus. C. gallicus. Fio. 21.—Secomlary quills. those of the mammalia, already described, that we cannot doubt they serve a simila
. Darwinism : an exposition of the theory of natural selection, with some of its applications. Natural selection; Evolution. 224 DARWINISM will serve to illustrate this difference; which is frequently much greater and modified in an endless variety of Avays (Fig. 22). Numbers of species of pigeons, hawks, finches, warblers, ducks, and innumerable other birds possess this class of mark- ings ; and they correspond so exactly in general character with. Cursorius chalcopterus. C. gallicus. Fio. 21.—Secomlary quills. those of the mammalia, already described, that we cannot doubt they serve a similar purpose.^ Those birds which are inhabitants of tropical forests, and which need recognition marks that shall be at all times visible among the dense foliage, and not solely or chiefly during flight, have usually small but Ijrilliant patches of colour ^ The principle of colouring for recognition was, I believe, first stated in my article on " Tlie Colours of Animals and Plants " in Macmillan's Magazine, and more fully in my volume on Tropical Nature. Subsequently Mrs. Barber gave a few examples under the head of " Indicative or Banner Colours," but she applied it to the distinctive colours of the males of birds, which I explain on another principle, though this may Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wallace, Alfred Russel, 1823-1913. London : Macmillan
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