0/1 the Animal Calculus ^ 205 
portions between the Vibrations of the fer- 
menting Liquor, and the Tone or Degree of 
Tenfenefs of the Parts of the Calculus: Juft 
as when two Strings are equally tcnfe, the 
ftriking of one will make the ocher found $ or 
as I have often obferved the different. Pipes of 
an Organ, will make different Boards vibrate, 
according to the Uniformity there is, between 
the Tenfenefs of the Fibres of the feveral 
Boards, and the Tone of the different Pipes. 
8. And in like manner we may not un- 
reafonably fuppofe, that when there is the like 
Uniformity between the Vibrations of the fer- 
menting Liquor, andthofeof the Parts of the 
Calculus^ that the Itus and Reditus of theft; 
Vibrations, increafing in this Cafe each other s 
Force, fome parts of the Calculus are there- 
by thrown off into elaftic Air. In Confirma- 
tion of this Conjedure, I have obferved Air 
to arife briskly from a Calculus with twenty or 
ten Drops of Oil of Sulphur, and yet with 
fifteen Drops little or no Air arofe, notwith- 
ftanding the Proportion of the other Ingredi- 
ents of the fermenting Mixtures, was the fame 
in all three Cafes, 
Exp eri- 
