. The descent of man : and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings. Chap. I. Riidiinents. 17 me probable that the points in question are in some cases, both in man and apes, vestiges of a former Fig 3. Foetus of an OranR. Fxact copy of a photograph, shewing the form of the ear at this early age. The nictitating membrane, or third eyelid, with its accessory mnscles and other structures, is especially well developed in birds, and is of much functional importance to them, as it can be rapidly drawn across the whole eye-ball. It is found in so
. The descent of man : and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings. Chap. I. Riidiinents. 17 me probable that the points in question are in some cases, both in man and apes, vestiges of a former Fig 3. Foetus of an OranR. Fxact copy of a photograph, shewing the form of the ear at this early age. The nictitating membrane, or third eyelid, with its accessory mnscles and other structures, is especially well developed in birds, and is of much functional importance to them, as it can be rapidly drawn across the whole eye-ball. It is found in some reptiles and amphibians, and in certain fishes, as in sharks. It is fairly well developed in the two lower divisions of the mam- malian series, namely, in the monotreraata and marsupials, and in some few of the higher mammals, as in the walrus. But in man, the quadruraana, and most other mammals, it exists, as is admitted by all anatomists, as a mere rudiment, called the semilunar fold.^^ The sense of smell is of the highest importance to the greater number of mammals—to some, as the ruminants, in warning them of danger; to others, as the carnivora, in finding their prey; to others, again, as the wild boar, for both purposes combined. But the sense of smell is of extremely slight service, if any, even to the dark coloured races of men, in whom it is " Miillev's 'Elements of Physi- ology,* Eng. translat., 1842. vol. ii. p. 1117. Owen, * Anatomy of Verte- brates,' vol. iii. p. 260; ibid, on the Walrus, * Proo. Zoolog. Soc' November 8th, 1854. See also R. Knox, 'Great Artists and Anato- mists,' p. 106. This rudiment ap- parently is somewhat larger in Negroes and Australians than in Europeans, see Carl Vogt, ' Lectures on Man,' Eng. translat. p. 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 Dar
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Keywords: ., bookcentury1800, bookdecade1870, booksubjecthumanbeings, bookyear
