5404 THE DESCENT ' OF MAN 



rangement of the hair on the limbs and the course of the 

 medallary arteries." ") 



It must not be supposed that jthe resemblances between 

 man and certain apes in the above i and many other points — 

 such as in having a naked fore|iead, long tresses on the 

 head, etc. — are all necessarily the ,tesult of unbroken inheri- 

 tance from a common progenitoi<', or of subsequent rever- 

 sion. Many of these resemblanctes are more probably due 

 to analogous variation, which fpllows, as I have elsewhere 

 attempted to show,'° from co:'descended organisms having 

 a similar constitution, and having been acted on by like 

 causes inducing similar modificatiojQS. With respect to the 

 similar direction of the hair on the forearms of man and' 

 certain monkeys, as this character is common to almost all 

 the anthropomorphous apes, it may proba!bly be attributed 

 to inheritance; but this is not certain, as som^ very distinct 

 American monkeys are thus characterized. 



Although, as we have now seen, man has no^ just right 

 to form a separate Order for his own reception, hft may per- 

 haps claim a distinct Sub-order or Family. Prof. i Huxley, 

 in his last work," divides the Primates into thr)ee Sub- 

 orders; namely, the Anthropidse with man alone, jhe Simi- 

 adse, including monkeys of all kinds, and the^emuridse 

 with the diversified genera of lemurs. As far as differences 

 in certain important points of structure are concelrned, man 

 may no doubt rightly claim the rank of a Sub-oi^der; and 

 this rank is too low, if we look chiefly to his meniS^al facul- 

 ties. Nevertheless, from a genealogical point of Vvjew, it 

 appears that this rank is too high, and that man ou^.ht ttT 

 form merely a Family, or possibly even only a Sub-fadlfjily, 



' On the hair in Hylobates, see "Nat. History of Mammals,"*, w o. L. 

 Martin, 1841, p. 415. Also, Xsid. Geofiroy on the American mon^,teys and 

 other kinds, "Hist. Nat. Gen.," vol. ii., 1859, pp. 216, 243. BsehriSgijt^ ibid., 

 8. 46, 55, 61. Owen, "Anat. of Vertebrates," vol. iii. p. 619. V. Wallace, 

 "Coatribntions to the Theory of Natural Selection," 1810, p. 344. \ 



"0 "Origin of Species," 5th edit., 1869, p. 194. "The Yariation\.„e 

 mals and Plants under Domestication," vol. ii., 1868, p. 348. \ und i"*" 



" "An Introduction to the Classification of Animals," 1869, p. 99. J 



