330 SEXUAL SELECTION : MAN. Paet 11. 



up or even increase their mental powers, and, as a con- 

 sequence, the present inequality between the sexes.^ 



24 



Voice and Musical Poivers. — In some species of Qnad- 

 rumana there is a great difference between the adult 

 sexes, in the power of the voice and in the development 

 of the vocal organs; and man appears to have inherited 

 this difference from his early progenitors. His vocal 

 cords are about one-third longer than in woman, or 

 than in boys ; and emasculation produces the same effect 

 on liimas on the lower animals, for it "arrests that pro- 

 " minent growth of the thyroid, &c., which accompanies 

 " the elongation of the cords." ^^ With respect to the 

 cause of this difference between the sexes, I have nothing 

 to add to the remarks made in the last chapter on the 

 probable effects of the long-continued use of the vocal 

 organs by the male under the excitement of love, rage, 

 and jealousy. According to Sir Duncan Gibb,^® the 

 voice differs in the different races of mankind ; and 

 with the natives of Tartary, China, &c., the voice of 

 the male is said not to differ so much from that of the 

 female, as in most other races. 



The capacity and love for singing or music, though 

 not a sexual character in man, must not here be passed 

 over. Although the sounds emitted by animals of all 

 kinds serve mauy purposes, a strong case can be made 

 out, that the vocal organs were primarily used and per- 



2* An observation by Vogt bears on this subject : he says, it is a 

 " remarkable circumstance, that the difference between the sexes, as 

 " regards the cranial cavity, increases with the develoj)ment of the 

 " race, so that the male European excels much more the female, than 

 " the negro the negress. Welcker confirms this statement of Huschke 

 " from his measurements of negro and German skulls." But Vogt 

 admits (' Lectures on Man,' Eng. translat. 1864, p. 81) that more obser- 

 vations are requisite on this point. 



25 Owen, ' Anatomy of Vertebrates,' vol. iii. p. 603. 



2<5 • Journal of the Anthropolog. Soc' April, 1869, p. Ivii. and Ixvi. 



