198 N. E. McINDOO 
Hearing is a physical sense. Sonorous waves, especially those of low 
sounds, are nearer to large mechanical vibrations than luminous, caloric, 
or electric waves. Hearing, therefore, must be in its origin connected 
with touch, but we make a distinct difference between the perception of 
a very low sound by touch and its perception by hearing. We must 
not forget that the specialization of the organ of hearing has reached in 
man a delicacy of detail which is evidently not found again in lower 
vertebrates. It is, I believe, the sense which removes us most from the 
lower animals. In animals as high as fish the auditory nerve is con- 
fused with other nerves, and the portion of the labyrinth most specially 
affected by our audition, the cochlea, has disappeared. 
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