^77 
Anahyfis of the Air. 
Experiment LXIX. 
From a quarter of a cubick inch of An- 
timony', I obtain’d 28 times its bulk of air. 
It was diftilled in a glafs retort, becaufe it 
will dcmettalize iron. 
Experiment LXX. 
I procured a hard, dark, gray Tyrites, a 
mineral fubJiancOy which was found 7 feet 
under ground, in digging for fprings on 
Walton-heathy for the fervice of the Right 
Honourable the Earl of Lincohy at his beau- 
tiful feat at Oatlands in Surrey 5 this mine- 
ral abounds not only with fulphur, which 
has been drawn from it in good plenty, 
but alfo with faline particles , which 
flioot vifibly on its furface, A cubick inch 
of this mineral yielded in diftillation s 3 cu- 
bick inches of air. 
Experiment LXXI. 
Half a cubick inch of well decrepitated 
fea-falt mixt with double its quantity of 
calx of bones generated 32 times its bulk 
of air : It had fo great a heat given it, that 
N all 
