Hearing and, 91
Sound-pipe, 33
Sounds, articulate, 50 _seq_., 60 _seq_.
Sounds, musical, three qualities, 11 _seq._
Speech:--
Cerebral Mechanism of song and, 60 _seq._
Defects, 57 _seq_., 73
Hearing and, 78, 82 _seq_.
Localisation centres in the brain, 72 _seq_., fig. 17
Loss of, caused by deafness, 84 _seq_.
Right-handedness, 69 _seq_., 80
Theories on the origin of, 1 _seq._
Three stages, 4
Spencer, Herbert, 76
Stricker, 77, 78, 80, 82, 90

T

Thorax, 18 _seq_., fig. 3
Throat, 43
Timbre, 13
Tuning-forks, 12, 13, 37
Tylor, 6

V

Ventricle, 33
Vocal cords, 29 _seq_., 35, 36, 37, 43, 93, figs. 10, 11
Vocal instrument, three parts 15 _seq_., 62 _et passim_
Bellows, 18 _seq_., fig. 1