( i87 ) 
The moft folid Parts of Animals or Vegetables 
commonly generated moft Air : Of Vegetables, Oak 
and Peafe generated the moft Air j Oak t of hs 
Weight, and 116 times its Bulk, and the Peafe more 
than f of their Weight and 396 times their Bulk. But 
of all Subftances, a Stone taken from the Bladder of a 
Man generated moft Air, namely a Quantity of Air 
645 times the Bulk, and above half the Weight of 
the Stone. 
Our indefatigable Philofophcr, to Judge the better 
of the refult of thefe Experiments, contrived a Gage 
with a Tube feal’d at one end, and having the other 
(open End) immers’d in Mercury cover’d with Honey, 
which in the rife of the Mercury in the Glafs wou'd 
leave a mark to Ihew how far the Mercury had rifen, 
fSee the Defcription and Draught of it in his Book, 
Tage 105: by the force of comprefs’d Air, or of the 
Air that is generated from fcveral Subftances whilft 
confin’d ; and propofes this Gage for raeafuring the 
Depth of the Sea, which muft anfwcr better than any 
Contrivance hitherto tried. 
From obferving that it wou’d require a Force 4S 
times greater than that of the Atmofphere, to com- 
prefs the Air that comes out of an Apple into the 
fame fpace again (which in an Apple of 16 fquare 
Inches Surface, is equal to 11776 Pounds, J he con- 
cludes that the greateft part of the faid Air muft be in 
a fix’d State, and preferv’d in that State by the Attra- 
d:ion of the Particles of Air and Apple in their Co- 
hefion ; otherwife Fruits and all other Subftances that 
contain much Air, wou d be torn to pieces by its re- 
pellent Force, with a greater Explofion than that of 
Gunpowder; and therefore that the Air when ex- 
tricated, does not confift of fibrous Particles wound up 
like little Springs, but of Particles which do not touch 
P p z one 
