86 flDf m ^zfymmWii&m 



EXPER. XVIIL 



BUt though Petroleum , especially 

 when re&ified, be, as f have 

 eliewhere noted, a moft fubtile Li- 

 quor, and the lighted I have yet had 

 occafion to try j yet to fhew you 

 how much the Incalefcence of Li- 

 quors may depend upon their Tex- 

 ture, I (hall adde, that having mixt 

 by degrees one ounce of rectified 

 Petroleum , with an equal weight of 

 ftrong Oyl of Vitriol , the former 

 Liquor feemed to work upon the 

 Surface of this laft named^almoft like 

 a Mmftruum^ upon a metal, innume- 

 rous and fmall bubbles continually 

 afcending for a while into the Oleum 

 Petr<e, which had its colour manifeft- 

 ly alter'd and deepened by the ope- 

 ration of the fpirituous parts. But 

 by all the adion and re-a&ion of 

 thefe Liquors 3 there was produced 

 no fuch fmoaking and boiling, or 

 intenfe heat ^ as if Oyl of Turpen^ 



