Analyfis of the Air. 1 8 3 



7 feet under ground, in digging for fprings 

 on Walton-He at l\ 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 

 {hoot vilibly on its furface. A cubick inch 

 of this ?nineral 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 32 times its bulk 

 of air: It had fo great a heat given it, that 

 all being diftilled over, the remaining fco- 

 ria did not run per detiqutuM. I cleared 

 the gun-barrel of thefe and the like fco- 

 ria, by laying the end of the retort on an 

 anvil, and ftriking long on the outfide with 

 a hammer. 



Experiment LXXII. 



From 2 1 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 ; fo the weight 



N4 of 



