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fmhility^ having this peculiaiy that it burns dowfiwards. 
Secondly, giveth fome Chymica! Analyfis of Nz/er, both 
hy calcination^ in which he faith that it burnsalmoftall a- 
way if refined 5 and by Deputation in a Retort ^ which 
maketh it yield a little Flegme^ then a Spirit^ firft in the 
fopm of a white^ and foon after in that of a red vapour, 
corrofiveand fetid^ leaving a C^p^l^^^^r/^^^ behind. Where 
the Author giveth us his opinion, that this Body being thus 
analyfed is rendered incapable of Redintegration 5 (con- 
cerning which the Reader may confult that Noble and Ex- 
perienced Philofopher Mr. Boyk^ in his Effay containing an 
Experiment with fome Confiderations touching the diffe- 
ring parts and Redintegration of 6'^/^-/?e/r^5 Printed i66i*) 
Thirdly^ examines the Queftion 5 whether tfm Niter is 
the fame with the Niter of the -^^^^ifr^/// 3 and rcfolveth it 
in th^ Affirmative. 
Fourthly^ enquireth into the Generation and Place of 
Niters Where he difcufleththat i;5?^///r/, whether in Hou- 
fesjor WallsyEarthen floarSj&c.N/^er generatedjOvJepara". 
ted^nd drawn from the Air by the heat and drynefs of the. 
Places, obfervingjthat the dryer the places, where Niter is, 
are kept, there is more N//er. Whereupon he difcourfeth 
largely of the Niter in the Air ^ and making it not only a 
Meteior k felfj and particularly a caufe of lightning and 
thunder^but a^e;!?er^/ caufe of Meteors, joy ntly with<S^«//?A;^r. 
Fifthly^ he declareih the Vfe of Niter to Animals and 
Vegetables 3 affirming firji 5 that the life of Animals^being a 
burning Sulphur^ is, as t were, kindled by the Nitrous Air 
received into the Lungs and communicated to the Heart 5 
and adding that as without Airjwhich is the life of Fire^the 
innate aninial: heat would extinguifh 5 fo that Air, being 
IV/>r^?iKf,not only inflames it, but from its Coolnefi fo allays 
the fame, that it doth not too much prey upon our Radical 
moifture5and keeps our life in its due Fermentation 5 and 
moreoverjby its diflblving nature renders the humors of the 
Body more fluid,and fomore apt to perform their Circular 
motions,fbr the entertaining of life. Secondly^ that with- 
out this Nitropy the Sulphur of Seeds would lye dormant in 
