26 ©f t$e $)ec&amcai Caufe* 



Meoftruurii are mortified or rendred 

 unfit for their former fun&ion^ by 

 particles of a Precipitant that are of 

 a contrary nature. 



Thus Gold and fottie other mine- 

 rals, being diflblved in Aqua Regis, 

 will be precipitated with fpirit of 

 urine and other fuch liquors aboun- 

 ding with volatile and falino-fulphu* 

 reous Corpufcles, upon whofe ac- 

 count it is that they ad: 3 whence 

 thefe falts themfelves, though caft 

 into a Menftruum in a dry form, will 

 ferve to make the like Precipitations* 

 And I the rather on this pccafion 

 mention Urinous fpirits than Salt of 

 Tartar, becaufe thofe volatile par- 

 ticles add much lefs of weight to the 

 little Concretions which compofe 

 the Precipitated powder. 



Upon inftances of this kind, many 

 of the modern Chymifts have built 

 that Antipathy t betwixt the Salts of 

 the folvent and thofe of the Menftru- 

 um, to which they afcribealmoft all 

 Precipitations. But againft this I 

 have reprefented fomething already, 



and 



