the HeJJian Pyrites. 359 



but fo poor as to be fold very cheap, it being but 

 little valued. Thus far M. Rofinus. 



II. The fpecific gravity of the Pyrites., 



As I myfelf was without a good hydroftatical 

 balance, I in this cafe applied to the celebrated 

 Dr. Meuder, who readily gave me his ailiftance 

 here, and not only examined the pyrites and its 

 concomitant matters in the molt accurate manner 

 poflible, and with repeated care and diligence, but 

 alio many others, and. thofe the principal, both 

 denfe and fluid bodies, as laid down in the fol- 

 lowing tables ; to which he has fubjoined a fet of 

 uncommon remarks and principles, and peculiar 

 ways of managing the hydroftatical ballance. The 

 fmall table o^ pyrites, fulphur, arfenic, &c. might 

 have feemed fufficient for my purpofe -, but as this 

 is a fubject hitherto not fo fully and fundamen- 

 tally examined, the reader will not be difpleafed if 

 I give the tables at length ; the fpecific gravity of 

 the pyrites, and its concomitant matters deferving 

 the utmoft regard, and a fubject being ever belt 

 illuftrated by comparifon with other matters. 

 Dr. Meuder goes on thus. 



As the fpecific gravity of each body is deemed to 

 be one of its character i ft ic marks, and as fuch ob- 

 fervations may be fuppofed of further phyfical ufe, 

 we have given the foi lowing tables of the fpecific 

 gravity of the principal and moll known mineral 

 bodies. 



1 Tranfparent amber. 



2 Colophony. 

 30 Brown pitch. 

 43 Black pitch. 



Ill Afphalum. 



244. Pu- 

 A a 4 



