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The Descent of Man

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It would, however, be rash to trust too much to<br />

the principle <strong>of</strong> adaptation in regard to the direction<br />

<strong>of</strong> the hair in man or his early progenitors;<br />

for it is impossible to study the figures<br />

given by Eschricht <strong>of</strong> the arrangement <strong>of</strong> the<br />

hair on the human foetus (this being the same<br />

as in the adult) and not agree with this excellent<br />

observer that other and more complex<br />

causes have intervened. <strong>The</strong> points <strong>of</strong> convergence<br />

seem to stand in some relation to those<br />

points in the embryo which are last closed in<br />

during development. <strong>The</strong>re appears, also, to<br />

exist some relation between the arrangement <strong>of</strong><br />

the hair on the limbs, and the course <strong>of</strong> the medullary<br />

arteries. (9. On the hair in Hylobates,<br />

see 'Natural History <strong>of</strong> Mammals,' by C.L. Martin,<br />

1841, p. 415. Also, Isidore Ge<strong>of</strong>froy on the<br />

American monkeys and other kinds, 'Hist. Nat.<br />

Gen.' vol. ii. 1859, pp. 216, 243. Eschricht, ibid.<br />

s. 46, 55, 61. Owen, 'Anatomy <strong>of</strong> Vertebrates,'<br />

vol. iii. p. 619. Wallace, 'Contributions to the<br />

<strong>The</strong>ory <strong>of</strong> Natural Selection,' 1870, p. 344.)

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