( 2^3 ) 
if y the Surface of the Water was above z, the fpacc 
“ between z and which was filled with Water, fliew- 
ed the Quantity of Air which had been abforbed in 
“ the Operation, i. e. was changed from a repelling 
“ elaftick, to a fixed State, by the (Irong Attradion 
of other Particles, which I therefore call alforbin^. 
“ When I would meafure the Quantity of this new 
“ generated Air, I feparated the Bolt-head from the 
“ Retort ; and putting a Cork into the fmall End of 
“ the Bolt-head, I inverted it, and poured in Water 
“ to 2, Then from another Veffel (^in which I had a 
“ known Quantity of Water by Weight) I poured 
“ in Water tojy; fothe Quantity of Water 'which w^as 
“ wanting, upon weighing this Vefiel again, was equal 
“ to the Bulk of the new generated Air I chofe to 
“ meafure the Quantities of Air, and the Matter from 
“ whence it arole, by one common Meafure of cubick 
“ Inches, eftimated Irom.the fpecifick Gravities of the 
“ feveral Subftances, that thereby the Proportion of 
“ one to the other might the more readily be feen. 
“ I made ufe of the following means to meafure the 
“ great Quantities of Air, which were either raifed 
and generated, or abforbed by the Fermentation 
“ arifing from the Mixture of Variety of folid and 
‘‘ fluid Subftances, w'hereby I could ealily eftirnate the 
furprifing EfFeds of Fementation on the Air, viz. 
“ I put into the Bolt-head h (^Fig. the Ingredients, 
“ and then run the long Neck of the Bolt-head into the 
“ deep cylindrical Glafs a y, and inclined the in' 
“ verted Glafs a y, and Bolt-head almoft horizontally 
in a large Veflel of Water, that the Water might 
‘‘ run into the Glafs ay ; when it w^as almoft up to 
“ the top of the Bolt head, I then immerled the 
“ Bottom of the Bolt head, and lower part j of the 
“ cylindrical Glafs under Water, raifing at the fame 
time 
