MECHANICS OF THE INNER EAR 67 



tical importance of a decision in this case is rather small, for 

 the reason that, whatever sensation these two sections might 

 produce, it would be a sensation of the relative intensity two 

 only, a rather weak sensation compared with the tones which 

 appear theoretically certain. 



The twelfth, thirteenth, and fourteenth sections of the 

 partition move down at B, a second time at F, a third time 



at J, and a fourth time at P. These sec- 

 Do we hear 4? tions, therefore, move down and up four 



times during the period in approximately 

 equal intervals. The five following sections of the partition 

 move dowm at B, a second time at F, a third time at L, and 

 a fourth time at P. These sections, therefore, move down 

 and up four times during the period in approximately equal 

 intervals. The four sections from the twentieth to the twenty- 

 third move down at B, a second time at F, a third time at L, 

 and a fourth time at P. These sections, therefore, move 

 down and up four times during the period in approximately 

 equal intervals. The following four sections m©ve down at B, 

 a second time at H, a third time at L, and a fourth time at 

 P ; that is, four times during the period in approximately equal 

 intervals. The four sections from the twenty-eighth to the 

 thirty-first move down at B, a second time at H, a third time 

 at L, and a fourth time at P; again, four times during the 

 period in approximately equal intervals. The thirty-second 

 and thirty-third sections move down at D, a second time at 

 H, a third time at L, and a fourth time at P. These sections, 

 therefore, move down and up four times during the period in 

 approximately equal intervals. It follows that according to 

 our theory we must expect to hear the tone 4 of a relative in- 

 tensity twenty-two, since it is produced by all the sections 

 from the twelfth to the thirty-third. 



