[302] It may be objected, perhaps, that excessive delicacy of the ear might have been produced by having to guard against the approach of enemies, some savages being remarkable for their keenness of hearing at great distances. But the perceptions of intensity and quality of sound are very different. Some persons who have an extremely acute ear for delicate sounds, and who are fond of music, have yet an incapacity for detecting whether an instrument is slightly out of tune.
[303] Loc. cit., pp. 351, 352.
[304] Loc. cit., p. 368.
[305] Loc. cit., p. 350.
[306] Published by John Churchill.
[307] Natural Selection, p. 324.
[308] The italics are not Mr. Wallace's.
[309] "Unity of Worlds," Essay ii. § ii. p. 247.
[310] Ibid. Essay i. § ii. p. 76.
[311] Ibid. Essay iii. § iv. p. 466.