106 UNIVERSITY OF MISSOURI STUDIES 



Let us examine the movements of the twenty-five initial 

 sections. From g to B they move down, and from B to D up. 

 From D to F down, that is, from an ex- 

 The tone 8 treme upward position to a medium up- 



ward position ; and from F to H they 

 move up again, that is, from a medium upward position to an 

 extreme upward position. From H to J they move down, and 

 from J to L up, completing thus the third down and up move- 

 ment. From L to N they move down and from N to P up, 

 completing thus the fourth down and up movement. From 

 P to R they move down, and from R to T up, completing 

 thus the fifth down and up movement. From T to V down, 

 and from V to X up, completing thus the sixth down and up 

 movement. From X to Z down, and from Z to 95 up, com- 

 pleting thus the seventh down and up movement. From 93 

 to © down and from 3) to $ up again. The nerve ends lo- 

 cated on these twenty-five sections therefore receive eight 

 shocks during the period, and accordingly, convey the sen- 

 sation of the tone 8. 



The thirty-six sections from the twenty-sixth to the sixty- 

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

 from D to F, and up from F to H. Down from H to J, and 

 up from J to L. Down from L to N, and up from N' to P. 

 Down from P to R, and up from R to T. Down from T to 

 V. and up from V to X. Down from X to ®, and up from <D 

 to g. The nerve ends located on these sections therefore 

 receive seven shocks during the period. But, in accordance 

 with previous considerations, it is highly improbable that they 

 could convey the sensation of the tone 7'. When seven shocks 

 are received in time intervals identical with those of the tone 

 8, and when the eighth shock, at the moment Z, chances to 

 be omitted, it is rather to be expected that the tone 8 is 

 heard, only with a little pause or, perhaps, merely a diminu- 

 tion of intensitv at the moment Z. The sensation conveyed 



