284 On the Acoujiic Experiments 



rious aerlfonn lubftances ? His ear would certainly have dif- 

 tinguiflied the falling of a third in the carbonic acid and ni- 

 trous gafes ; and he muft, no doubt, have been ftruck with 

 the prodigious rife occafioned by the hydrogen. 



At the time Prieftley made his experiments I was engaged 

 in fome of the fame kind, the refults of which were publifned 

 in the Memoirs of the Academy of Sciences of Turin for the 

 years 1786 and 1787. In my paper it may be feen that \ 

 fucceffively filled a bottle, and inverted it in a pneumato-che- 

 mical preparation of various aeriiorm fubflances; and in 

 thcfe atmofpheres I rung a fmall bell, and made a repeating- 

 watch ftrike. As the founds reached my ear, I paid atten- 

 tion to the variations they exhibited in regard to the tone, 

 its intenfity, and the vibration. To affiil my car I made ufe 

 of a violin. Some idea may be formed of the refult of my 

 labours, by cafting an eye over the firfl table of my memoir, 

 of which the following is a copy \ — 



