a<5 ©f t^e #ec&antcal Biisint of 



the other Spirit to be poured, (which 

 it fhould warily be)upoo the agitated 

 mixture j whofe effervefcence, at the 

 fir ft inftant^ feemed to he cnuqh ia- 

 creafedj but prefently after was 

 cheeked, and the Corrofivenefs of 

 the M-nftruum being fpeedily difc 

 ahled or corre&ed , the remaining 

 Copper was left undiffolved at the 

 bottom, 



Nor are thefe the onely acid Men- 

 ftruuaisthat I have many years fince 

 been able to correft by fuch a way : 

 For I applied it to others , as Spirit 

 ef Nitre y and even Aqua Regis it 

 felf 5 but it has not an equal opera- 

 lion upon all , and leaft of all ( as 

 fa* as lean remember) upon Spirit 

 of Salt j as on the other fide ftrong 

 Spirit of Nitre was the JMenftruum 

 Upon which its effects were the mod 

 fatisfa&ory* 



Moft of the Cbymifts pretend, 

 that the Solutions of bodies are per- 

 farriul by a certain Cognation and 

 Sympathy between the MJenftruum 

 the body « is to work upon* 



And 



