From STRONtlAN. 21 



of fulphur and cryftals of Strontites, I poured fome hot wa- 

 ter, which I caufed to boil for fome time. A Uquid hepar, of 

 a dark yellowilli brown colour, was the produdl, and fhowed 

 the fame qualities as the preceding. 



50. Crystals of Strontites were dilTolved, but fparlngly by 

 alcohol. The tindure was of a yellow colour, and burned 

 with a reddilh flame. 



51. Having detailed all the properties of the Strontian mi- 

 neral, and of its earthy bafe, with which 1 have made myfelf 

 acquainted, my next objedl fliall be to confider, and, if pofll- 

 ble, to determine, whether this earth be really different and 

 diftindl from all thofe that are already known. There are two 

 kinds to which the Strontitic bafis bears in its properties no in- 

 confiderable refemblance, I mean barytes and lime ; yet it feems 

 to me to differ as much from both of them as they differ the 

 one from the other. In external appearance, it muft be ac- 

 knowledged, fome fimilarity is obfervable among the native 

 carbonates of thefe earths. The Strontian foffil refembles mod 

 the barytic fpar. Indeed this is fo much the cafe, that many 

 perfons admitted it into their colledlions as the aerated barytes. 

 Nay, a French chemift of fome note, M. Pelletier, informs 

 us, that having analyzed a mafs, which he received from the 

 Honourable Mr Greville, he did not publilh the refult. for 

 the reafon, " qu'elle ne m'avoit fourni rien de particulier *." 



52. These two produdlions of nature agree in exceeding 

 other earthy fpars in fpecific gravity ; in retaining their carbo- 

 nic acid, unlefs when urged by a very intenfe heat ; in dif- 

 folving when cauftic in water ; in affording the pure earth 

 in cryftals ; in diffolving in acids with nearly limilar phe- 

 nomena ; in forming falts of difficult folubility with feve- 

 ral of the acids, and cryftallizable ones with the nitric 

 and muriatic. In thefe refpedls a ftrong analogy prevails 

 between them, yet it is but an analogy > for in the point"- nf)w 



enumerated'^, 



* Ann. de Chem. t. lo. p. 188. 



