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 speciahzation of the organ of hearing has reached in 

 man a dehcacy of detail which is evidently not found again in lower 

 vertebrates. It is, I beheve, 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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