A NEW THEOBY OF HEARING. 353 



It will be noted that the physical limit of this acceler- 

 ation is not closely approached. That limit would be 

 approximately the velocity of sound in the liquid, i.e., 

 nearly a mile per second, 1435 metres. 



Explanation of Plate XX. 



Figs. 1 to 5. Diagrams, see pp. 328, 329, 337. 



Fig. 6. Transverse section across middle canal of cochlea, 



see p. 339. 

 Fig. 6a. Part of Fig. 6 enlarged. 



