I*HYSiCAL A!?D LiTEkARt. 16^ 



coagulum was immediately formedj and a 

 tnagncjia precipitated from the mixture. 



The magnejiu which had remained in the 

 retort, when well wa(hed and dried, vyeighed 

 two fctuples and fifteen grains. - 



We learn by the lattfer part df this fe^pfef!^ 

 ment, that the IttradliOfi of the volatile alkali 

 for acids is ftronger than that of magn{fia^ 

 fince it feparated this powder from the acid 

 to which it Was joineti. But it alfo appears, 

 that a gerttle heat is capable 6F titnercomirig 

 this fap^riority of attradion, and of gradually^ 

 elevating the alkali, while it leaves the lefs 

 volatile acid with the niagitefiu, 



Dissolve a dfafli of any c^lcariouS itiB-* 

 ftancte in the add of tikre or of common faltv 

 taking care that the folution be tendered per-' 

 fedly neutral, or that no fuperjfluous acid be^ 

 added. Mix with this folution a dram of 

 m&piefm iti fine powder, arid digeft k hi the 

 heat of boiling water about twenty fouf 

 hours } then dilute the mixture with double 

 its quantity of water, and filtrate. The 

 great^ft part of the earth ftbW left In the 

 filtre is calcarious, drtd the liquor which 

 jjaffed thro', if mixed with a diflbived alkali. 

 Vol. IL V yields 



