A. M. Mayer — Researches in Acoustics. 3 



The physicists Mr. Alexander J. Ellis and Professor J. A. 

 Zahm have discussed the bearing of the law (as given by the 

 experiments of 1874 and 1875), on the elucidation of many 

 facts in consonance and dissonance, to which application of the 

 law I referred in my paper of 1871.* 



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On the Duration of the Residual Sonorous Sensation. — 

 The duration of a residual sonorous sensation is really the 

 duration of the entire period in which a sensation of sound is 

 perceived after the vibrations, outside the ear, giving rise to 

 that sensation, have ceased to exist. While the total duration 

 of the after- sensation produced by the stimulus of light can 

 be measured (as in the case of an electric flash), the determi- 

 nation of the total duration or the after-sensation of a sound 

 appears, in the light of onr present knowledge and with the 

 means of experiment at our command, to be a problem very 

 difficult to solve. 



The object of this research was not to determine the total 

 duration of the after- sensation of a sound, but to measure that 



*See Ellis' translation, of 1875, of Helmholtz's Lehre von den Tonempfin- 

 dungen, pp. 173, 701, 795, and Ellis' Illustrations of Just and Tempered Intona- 

 tion. Proc. Musical Assoc, of London, June 7, 1875. Zahm, Sound and Music ; 

 Chicago, 1892. 



