6o 



ILLUSTRATIONS OF THE 



t 



them, with the mod beautiful and varied ramifi, 

 cations, are every where to be met with in the 

 cabinets of the curious ; and contain, in their 

 ftrudure, the cleareft proof, that the metal and 

 the quartz have been both foft, and have cry- 

 ftallized together. By the cornpadnefs, alfo, of 

 the body which they form, they fliow, that 

 when they acquired folidity, it was by the con- 

 cretion of the whole mafs, and not by fuch par- 

 tial concretion as takes place when a folvent 

 is feparated from fubflances which it held in fo- 

 lution. 



52. Native copper is very abundant; and 

 fome fpecimens of it have been found cryftal- 

 lized. Here the cryilallization of the metal is 

 a proof that it has palTed from a fluid to a fo- 

 lid ftate ; and its purity is a proof that it did 

 not make that tranfition by being precipitated 

 from a menflruum. 



53 



g 



P 



f 



been found poiTeliing fo 



native manganefe have 

 exactly the charafters 

 peculiar to that metal when reduced in our fur- 

 naces, that it is impoiTible to confider them as 



figure and folidity from any caufe 



b 



f 



rxy 



rh 



{^ 



nge 



auth 



h 



de 



fciibes thefe fpecime 

 forcibly' 11 ruck w 



I 



Peyroufe, was fo 



diately d 



th 

 th 



this 



fembl 



fa 



lufi 



thai 

 fro 



he 



which is drawn here, attributing the only differ- 



ence, 



^ 



