of Alcatf anfc Arftomn 15 



which Chymifts will fcarce be able 

 to form clear and fetled Notions of 

 them. For to infer, as is ufual, that, 

 becaufe a body diflblves another 

 which is diflbluble by this or that 

 known acid, the Solvent muft alfo be 

 acidi or to conclude, that, if a body 

 precipitates a diflblved metal out of 

 a confefledly acid Menftruum, the 

 Precipitant muft be an Alcali^to argue 

 thus,l fay 'tis unfecure i fince^not to 

 repeat what I faid lately of Copper, I 

 found, that filings of Spelter will be 

 diflblved as well by fome Alcalies 5 (as 

 fpirit of Sal Armoniac) as by Acids. 

 And bodies may be precipitated out 

 of acid Menftruums, both by other 

 Acids, and by liquors, where there 

 appears not the leaft Alcali : As I 

 have found, that a folution of Tin* 

 glafs, made in Aqua fortis^ would be 

 precipitated both by Spirit of Salt 

 and by common or rain water. And 

 as for the other grand way that Chy- 

 nrifts employ 5 todiftingui(h Acids and 

 Alcalies,namely by the Heat,Commo- 

 tion; and bubbles that are excited, 



upon 





