mechanics of the inner ear 

 Interval 24:25, Equal Amplitudes 



53 



If we regard — quite arbitrarily — the time from one stimu- 

 lation to the next as measurable by the abscissa differences 



of the succeeding maxima, we observe that 

 Do we hear this difference is about one hundred and 



the tone 25? forty-seven at the beginning of the period, 



that it decreases very slowly and is about 

 one hundred and forty-five at the maximum twentj^-three, 

 about one hundred and fifteen at the maximum twenty-five, 

 the same at the maximum twenty-seven, and that it increases 

 gradually till the end of the period. One twenty-fifth of the 

 whole period is one hundred and forty-four. This is the average 

 abscissa difference, on which the pitch of the tone heard depends, 

 since the abscissa difference is inversely proportional to the fre- 

 quency of stimulation. But the actual abscissa differences, as we 



