4 Elements of Mineralogy. 



and when in lumps, heats with a moderate 

 quantity of water. 



2 a - In the temperature of 60? it requires 

 about fix hundred and eighty times its weight 

 of water to diffolve it ; its tafte is then pun- 

 gent, urinous, yet fweetifh. 



3 d - It is combinable with all acids, and in 

 particular eafily foluble in the nitrous or 

 marine, but difficultly cryftalizes with them, 

 as it forms deliquefcent falts, and is in 

 great meafure precipitable from them by the 

 vitriolic, to which it preferably unites, 

 forming gypfum or felenite, which is wholly 

 precipitable from them by the affufion of 

 highly rectified fpirits of wine, or moderate 

 evaporation, nitrous felenite eafily parts with 

 its acid, when calcined in open veflels and 

 a red heat; but marine felenite fcarcely. 

 Both felenites have a bitter tafte. 



4 th * When in vefiels on which it cannot 

 ai, it is infufible per fe (that is fingly;) in a 

 heat that would melt iron : yet Mr. Parker s 

 glafs feems to have induced a flight beginning 

 of fufion in lime, even when it flood on 

 charcoal, but if mixed with argillaceous, mag- 

 neiian or iiliceous Earths, it will melt in a 

 more moderate heat, and particularly if mixed 

 with two or more of thole Earths. And 



hence 



