MECHANICS OF THE INNER EAR 101 



down and up movement. From X to 21 they move down, 

 and from 21 to E up, completing the seventh down and up 

 movement. From 6 to 2) they move down, and from SD to g 

 up, completing the eighth down and up movement. From g 

 to @=A they begin to move down and continue to move 

 down after A, as we have seen. 



The movements of the forty-nine initial sections are so sim- 

 ilar to those of the three sections just discussed that we convince 

 ourselves easily that the nerve ends located there receive the 

 same number of shocks during the period. 



The fifty-third and fifty-fourth sections move down from g 

 to B, and up from B to D. Down from D to G, and up from G 

 to H. Down from H to J, and up from J to L. Down from 

 L to N, and up from N to Q. Down from Q to R, and up from 

 R to T. Down from T to V, and up from V to X. Down 

 from X to 21, and up from 2t to ff. Down from G to ®, and 

 up from 55 to g. The nerve ends located on these sections 

 therefore receive eight shocks during the period. 



The ten sections from the fifty-fifth to the sixty-fourth move 

 down from g to B, and up from B to D. Down from D to G, 

 and up from G to H. Down from H to J, and up from J to L. 

 Down from L to N, and up from N to Q. Down from Q to S, 

 and up from S to T. Down from T to V, and up from V to 

 X. Down from X to 21, and up from 21 to £. Down from © 

 to 25, and up from 35 to 3f. The nerve ends located on these 

 sections therefore receive eight shocks during the period. 



The twelve sections from the sixty-fifth to the seventy-sixth 

 move down from g to B, and up from B to D. Down from D 

 to G, and up from G to H. Down from H 

 The tone 6 to J, and up from J to L. Down from L 



to Ny and up from N to T. Down from 

 T to V, and up from V to X. Down from X to 35, and up from 

 35 to g. The nerve ends located on these sections therefore re- 

 ceive six shocks during the period. 



The twenty seven sections from the seventy-seventh to the 



