alfo by barely beating Gold info Fuch 

 thin leaves as Artificers and Apothecaries 

 are wont to employ , it will be brought 

 to cxhibite a green Colour , when you 

 hold itagainft the Light, whether of the 

 day, or of a good Candle j and this kind 

 of Greennefs as 'tis permanent in the fo- 

 liated Gold , fo I have found by trial, 

 that if the Sun-beams, fomewhat united 

 by a Burning-glafs, be trajedted through 

 the expanded Leaf, and caft upon a piece 

 of white paper, they will appear there as 

 if they had been tinged in their paflage. 

 Nay, and fometimes a flight and almoft 

 momentany Mechanical change will feem 

 to over rule Nature, and introduce into 

 a body the quite oppofite Qualify to that 

 ihe had given it : As when a piece of 

 black Horn is, onely by being thinly (cra- 

 ped with the edge of a knife or a piece 

 of glafs , reduced to permanently white 

 Shavings. And to thefe Inftances of 

 Colours, fome Emphatical and (bme Per- 

 manent, might be added divers belong- 

 ing to other Qualities, but that I ought 

 riot to anticipate what you will elfewhere 

 meet with. 



There is yet another way of arguing 



in favour of the CorfvjcHlarian Do&rine 



of Qualities , which , though it do not 



afford direct proofs of its being the beft 



B Hyfo- 



