Title: The descent of man, and selection in relation to sex
Identifier: descentofmansele000darw (find matches)
Year: 1971 (1970s)
Authors: Darwin, Charles, 1809-1882
Subjects: Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings
Publisher: New York: D. Appleton and Company
Contributing Library: Brigham Young University Hawaii, Joseph F. Smith Library
Digitizing Sponsor: Consortium of Church Libraries and Archives

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Chap. XVII.) MEANS OF DEFENCE. 253 surfaces would, however, if the head were held a little laterally, serve as an excellent guard; and hence, per- haps, it is that in old animals they " are generally broken off, as if by lighting." 36 Here, then, we have the curious case of the upper tusks of the Babirusa regularly assum- ing, during the prime of life, a structure which apparently renders them fitted only for defence; while in the Euro- pean boar the lower and opposite tusks assume in a less degree and only during old age nearly the same form, and then serve in like manner solely for defence.
Text Appearing After Image:
iiiwi i run i inn oravi uw (wrowuw ui mi ii redtK '-d nciile. the chiiructi iH ol tin- mule i Iii the wart-hog (P/ntcnr/iocrus a-thhtpirus, Kig. the tusks in the upper jaw of the male ourve upward dur- ing the prime of life, and, from being pointed, serve ai for midahlc weapons. The tusk- in the lower ja* sre sharper ihan thorn- in the upper, hut from their Bhortnesi it leemi hardly possible thai they can be a Bed as weapons of at tack. They must, however, greatly itrengthen those in the â ⢠Soe Mr. Wallace'* Intcrontlng account of thlft animal, 1 Thi Kslsj Archipelago,' 1800, vol. I. p. 135.

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