$2 3(mpecfed:tonoft^e€^mtft 5 



about Qualities, to the other which 

 confifts of thofe, wherein either that 

 does not happen whieh according to 

 their Hypothefis ought to happen^or 

 the contrary happens to what accord* 

 ing to their Hypothefis may juftly be 

 expe&ed. Of this you will meet with 

 inftances hereafter 5 I (hall now trou- 

 ble you but with one, the better to 

 declare my meaning. \Fis not un- 

 known to thofe Chymifts 5 that work 

 much in Silver and in Copper, that 

 the former will endure Ignition and 

 become red* hot in the fire, before it 

 will be brought to fufion 5 and the 

 latter is yet far more difficult to be 

 melted down than the other 5 yet if 

 you feparately diflblve thofe twa 

 metalls in Aquafortis? and by evapo- 

 ration reduce them to Cryftalls 7 

 thefe will be brought to fufion in a 

 very little time, and with a very mo- 

 derate Heat D without breaking the 

 glades that contain them. If you 

 ask a vulgar Chymift the caufe of 

 this facility of fufion, he will proba- 

 bly tell you without fcruple^ that 'tis 



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