Analyfts of the Air, 183 
7 feet under ground, in digging for fprings 
on Walton-Heathy for the fervice of the 
Right Honourable the Earl of Lincoln, at 
his beautiful Seat at Oatlands in Surrey ; this 
mineral abounds not only with fulphur, 
which has been drawn from it in good plen- 
ty, but alfo with faline particles, which 
Ihoot vifibly on its furface. A cubick inch 
of this mineral yielded in diftillation 83 
cubick inches of air. 
Experiment LXXI. 
Half a cubick inch of well decrepitated 
Sea-falt, mix’d with double its quantity of 
calx of bones, generated 31 times its bulk 
of air : It had fo great a heat given it, that 
all being diftilled over, the remaining fco- 
ria did hot run per deliquium. I cleared 
tlje gun- barrel of thefe and the like fcoria, 
by laying the end of the retort on an anvil, 
and linking long on the outfide with a 
hammer. 
Experiment LXXII. 
Erom 21 1 grains, or half a cubick inch 
of Nitre, mixed with calx of bones, there 
arofe 90 cubick inches of air, i. e. a quanti- 
ty equal to 180 times its bulk 5 fo the weight 
N 4 ' of 
