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Lixivial Salts of Plants,  Le@. Ul. 
Scammony yields Two Scruples of Cap. Mort. of which, about half a 
Scruple is Sa/z. 
Gutta Gamba yields but half'a Scruple of Cap. Mort. of which four 
or five Grains are Salt. 
So that confidering the Dofe of any Cathartickh Gumm, the quanti- 
ty of the Fixed A/kaly, is extream fmall with refpe& to the Volatile 
parts : In which, therefore, its Crthartick, Power doth chiefly refide. 
Yet none of the Cathartich Gumms are without fome portion, more 
orlefs, of a Fixed Alkaly; though fome of the reft are. Which feem- 
eth to prove, That the Fixed it felf, hath fome Intereft in the bufinelS 
of Purgation: as by being a Clog to the Volatile, and fo preventing its 
being deleterious 5 or fome other way. But the manner of their Ope- 
vation will better be underftood, when the Volatile Parts. have like- 
wife been examined. 
Tt may alfo be of good import, to know, what different quanti- 
ties of Sult, are afforded by the Tartars of all forts of Wines Where- 
by, partly, as well as by the quantity of the Tartar, we may be ena- 
bled the better to judge of the Nature of Wines. 



