A, M. Mayer— Researches in Acoustics. 243 
the resonator, while the spaces of card-board between the open 
sectors was twice the width of these openings. Thus the res- 
their succession they blended into a continuous, smooth sensa- 
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some series of experiments all of the resonators were replaced 
by this funnel of gutta-percha and that the results were the 
same as those obtained by the use of the resonators. I now 
obtained the aid of a friend who has a trained musician's ear, 
and he and I arrived at the following results,—the mean of our 
Separate determinations. He always required a greater num- 
ber of beats per second to obtain the continuous sensation. 
