330 
SEXUAL SELECTION: MAN. 
Fart II. 
up or even increase their mental powers, and, as a con- 
sequence, the present inequality between the sexes. 24 
Voice and Musical Powers . — In some species of Quad- 
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 him as on the lower animals, for it “ arrests that pi' 0 ' 
“ minent growth of the thyroid, &c., which accompanies 
“the elongation of the cords.” 23 With respect to the 
cause of this difference between the sexes, 1 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, 26 the 
voice differs in the different races of mankind ; ant 
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 al 
kinds serve many purposes, a strong case can be made 
out, that the vocal organs were primarily used and p er 
24 An observation by Vogt bears on this subject : be says, it * s n 
“ remarkable circumstance, that the difference between the sexes, » s 
“ regards the cranial cavity, increases with the development of 
“ race, so that the male European excels much more the female, tb» 
“ the negro the negress. Welcker confirms this statement of Huschke 
“ from his measurements of negro and German skulls.” But V°S 
admits (* Lectures on Man,’ Eng. translat. 1864, p. 81) that more obse - 
vations are requisite on this point. 
25 Owen, ‘ Anatomy of Vertebrates,’ vol. iii. p. 603. 
28 ‘ Journal of the Anthropolog. Soc,’ April, 1S69, p. lvii. ami lxvn 
