of 'uarious refractory Bodies* 339 



probability no body, except fome of the combuftible 

 ones, which is exempt from the law of fufion by heat. 

 If the primitive earths, and fuch minerals, as several 

 of thofe which have been mentioned, above, are fulible, 

 no doubt can be entertained that all other mixtures and 

 combinations of earths are fuiible alfo : for, fuch mix- 

 tures and combinations are known to be more fufible 

 than the primitive earths ; the metals are more fulible 

 than the earths, and the diamond along with carbon, 

 in its other pureft forms, appears to be really the only 

 exception j and it is probable that this is only a feem* 

 ing one, for, it is scarcely poffible to expofe thefe bo- 

 dies to the heat of the compound blow pipe, without 

 at the fame time burning them up : could the heat be 

 applied without expofing them to the contact of oxi- 

 gen is it not probable that they alfo would be added tc? 

 the lift of fulible bodies ? 



Ifak College^ Mayl, 1812, 



