. The descent of man, and selection in relation to sex. Evolution; Natural selection; Sexual selection in animals; Human beings -- Origin; Sexual dimorphism (Animals). 22 THE DESCENT OF MAN. (Tart L. ing. (Fig. 2.) These points not only project inward, but often a little outward, so that they are visible when the head is viewed from directly in front or behind. They are variable in size and somewhat in po- sition, standing either a little high- er or lower; and they sometimes occur in one ear and not on the other. Now the meaning of these projections is not, I think, doubt- ful; but it may be
. The descent of man, and selection in relation to sex. Evolution; Natural selection; Sexual selection in animals; Human beings -- Origin; Sexual dimorphism (Animals). 22 THE DESCENT OF MAN. (Tart L. ing. (Fig. 2.) These points not only project inward, but often a little outward, so that they are visible when the head is viewed from directly in front or behind. They are variable in size and somewhat in po- sition, standing either a little high- er or lower; and they sometimes occur in one ear and not on the other. Now the meaning of these projections is not, I think, doubt- ful; but it may be thought that they offer too trifling a character to be worth notice. This thought, however, is as false as it is natural. Every character, however slight, Fig. 2.—Human Ear, modelled must be the result of some definite and drawn by Mr. Woolner. .. „ ., a. The projecting point. cause; and if it occurs in many individuals deserves consideration. The helix obviously consists of the extreme margin of the ear folded inward; and this folding appears to be in some manner connected with the whole external ear, being per- manently pressed backward. In many monkeys, which do not stand high in the order, as baboons and some species of macacus,26 the upper portion of the ear is slightly pointed, and the margin is not at all folded in- ward ; but if the margin were to be thus folded, a slight point would necessarily project inward and probably a little outward. This could actually be observed in a specimen of the Ateles beelzebuth in the Zoological Gar- dens ; and we may safely conclude that it is a similar structure—a vestige of formerly-pointed ears—which oc- casionally reappears in man. The nictitating membrane, or third eyelid, with its 95 See also some remarks, and the drawings of the ears of the Lemu. roidea, in Messrs. Murie and Mivart's excellent paper in' Transact. Zoo- ,og. Soc.' vol. vii. 1869, pp. 6 and Please note that these images are extracted from scanned page i
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Keywords: ., boo, bookcentury1800, bookdecade1870, booksubjectnaturalselection
