( without which caution the Opera- 

 tion may prove dangerous,) we u- 

 nited them by two or three Diftilla- 

 tions of the whole mixture j which 

 afterwards we found not to have the 

 leaft fretting tafte, and to be fo de- 

 prived of its corrofive nature, that it 

 would not work upon Silver*, though 

 by Precipitation or otherwife re- 

 duc'd to very (mall parts 5 nay ,. it 

 would fcarce fenfibly work in a good 

 while on Filings of Copper, or up- 

 on other bodies , which meer Vine- 

 gar 5 or perhaps Rhenifh wine will 

 corrode* Nay, I remember, that with 

 another Spirit, (that W as not Uri- 

 nous ) and afterwards with Alf^pol 

 of Wine we (hew'd a more furpri- 

 zing Specimen of the power of ei- 

 ther deftroying or debilitating the 

 Corrofivenefs of a Menfiruum , and 

 checking its Operation. For 5 ha- 

 ving caufed a piece of Copper- plate 

 to be put into one ounce of Aqua, 

 Forti/^ when this Liquor was eager- 

 ly working upon the Metal, Icaus'd 

 an ounce of the Alkool of Wine, or 



the 



