Biitlfb M'lneralogical Society. 367 



by a folution of carbonate of potafli. The carbonate of lime 

 thus obtained, being fcparated by the filter, and expofed to 

 ignition in a black-lead crucible in a furnace for two hours, 

 gave 125*2 grains of lime. 



Satin fpar, lOO parts contain. 



Carbonic acid A, 47-6 | Carbonate of lime - 97-680 



Lnne, B, D, E, 5008 J ^' 



Iron, C - - - - 0x3 



Lofs (probably water of cryftallization) - 3*308 



lOO'OOO 



Havino; repeated the experiments with a very perfeA piece 

 of the fpar, I was not, during the whole proccfs, able to de- 

 tedl the fnialleft portion of iron. I did not, in this inllance, 

 decompofe the felenite formed, as it rated when ignited at 

 49-5 per cent, of lime. The minute portion of iron dcteded 

 in the firft analvfis muft therefore have been produced from 

 fome fmall pyritic grains in the fublknce of the fpar then 

 employed. Its quantity, as may be oblerved, was only 

 about a thoufandth of the whole. 



Remarks on the Affinities of L'lmc, Strontian, and Bcrjtes. 



Previous to the foregoing analyfis it was necclTary to in- 

 ftitute a few experiments on the affinities of the above-men- 

 tioned fubdance : as the rcfults may perhaps be ufeful to 

 others, they are here fubjoined. 



A folution of nitrate of lime in diftilled water, is partially, 

 but not immediately, precipitated by a folution of cauttic 

 ftrontian. On joining the two, the mixture allumes a fizey 

 appearance. 



A precipitation takes place alfo in a folution of nitrate of 

 Jime, when a folution of cauftic barytes is added. The pre- 

 cipitate falls down much fooner in this cafe, and in more 

 confidcrable (juaniitv, than wlien the folution of Ilrontian is 

 employed. 



Is' itratc of barytes in folution is inuncdiately dccompofed 

 by pouring into it a folution of fulphate of foda, which pro- 

 duces a coi)ious prccipitaic. •^^ 



Nitrate of Itroiitian in folution is alfo dccompofed by fnl- 

 phate of foda when a folution of the latter is poured into it, 

 but much (lower than the nitrated barytes. 



A folution of nitrate of lime, upon having a folution of 

 fulphate of foda added to it, docs not infiantly give a prccipi- 

 tat'-, but in a very (hort time after yields a granulated preci- 

 pitate of a more confiftcnl form than any of the before men- 

 l!(ji)ed. 



The 



