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by Tachemsts. And somcrimt s several parcels of 7W<»r,which seem to our Tastand Eye Calane d to the (ame Degree, yet the Operations in Nice Experi-ments are frequently Various. And to me it doth not leern so very wonder-ful, that many Concretesdo really Differ, which to the Senses appear Simpleand Uniform; ot which rrany Causis may be alligned. A great Number,and Variety of Instances might be here introduced to clear this Truth, if itwere not already seifficiently knownand believcd.

But to procecd where I Digrtsted; What I have Affirted is Confiimed bythe great Variety, which is raost vilible in Pot-aßies : Some being Highly AI.calizate are very Hut ; others Ccli, Watry, Nitrous to the Pointe, and nolefs weak in Effects than Taste; whereof Soap hoylers , Dyers and other Me-chanicis are very sensible. All which proceeds from the Woods being,when they are Rurnt Greenot Dry ; from their Abounding with Oüy, Aqtteuser Acetous parts ; as also from the several Degrees of Heat imployed in theirProduction. Those who mak eGlafs, and efpecially the finer sorts thereof,complain that they cannot with the fame Quanrities and Proportions of ln-gredients always produce the fame sort of Glast : Which they, not withoutReason, ascribed to the Diff'erencts'm thcW Ajhes. This muit nccessarily os-ten happen aecordly to the latcly mentioned Hypotheßs.

That which bath been seid ot Alcalhutte Saks, may likewise be Affirmedconcerning Vdatile Salts, and Vineus Spints : The former are afforded not lo8 ' r ' !Sp ‘only by Vegetab/es and Animals , but also by some Minerals: And althoughimmediately upon their Pioductionor hxtraftkn out of the several Substan-ces, which did yield them, they appear sensiby Different from each other, andare without difpute endowed with very Different Properstes, chiefly Medici-nal; yet they may all by Slight Artifices be reduced into such a SimpUcityand Identity, as that ncither the most Acute and FaithfulSenses, nor the mostRational and Nice Experiments, can find or make, without Additaments, theleast Disegreement or Difcrimination.

Velattfe Safts abound in most Vegetables , from which they föntetimes maybe Extricated by simple D ißiüation ; but ufually previous Fermentation is re-quired: of which Operation I have formerly rendered a particular Account. VllL ÄThis So ’t may be also obtained from Soot, Urine, the Bloodoi Men&nA other vit, “Animals ; from Etnes , and efpecially Cranium' s or Skuls of Mtn\ from ma-ny fbrts of Horns ; fand indeed no fubjtct yields them so copioufly, as thosewhich are Annually cast by Staggs or other Deer ;) from Vipers in great plen~ty ; as also from diverse other Animals. I need not here menrton Fathtiousiah Armtniack , that being a Commixture of several of the mentioned Luft-starte« with Sea-Salt. Also many Minerals and Foffls contain Volatile Sah-,

▼äst quantities of Sah Armeniaci being found in many parts of the East,whichwas probably Sublime d into those Caverns, whcnce it ü extracted, by thefbree of SubtaranealFirts : Whkh Conjecture is sufficienti y autherised bythe ferne Substances being gathered nearthe Crateres or Mouths of our Eh-rupean Vulcano' s of 'sEtna, Hecla, Vesuvius , in Campis Phlagreis ; in Englandalso near the Mcuth of several Cool- Mines, which have betn accidtenfaßyFired: And of Recent Memory that Torrent of Melted Minerals, which

boiled