74 



the circular indentures remaining on the bubbles : see the 

 right hand figures at the bottom. They are very neatly 

 formed upon whitish cubic Fluor, and seem as if they had 

 splashed about in falling ; for they give the idea of having 

 dropped on the surface of the crystals of the Fluor in a 

 state of strong ebullition, perhaps more so than the former. 

 Whatever is the cause, the effect may be gained by a 

 stronger heat; as, the nearer these substances approach 

 combustion, the more they harden, and form the appearance 

 of Asphaltum, which we suspect this substance to be. 

 This is from the same neighbourhood as the others, and is 

 totally black all through. Fracture conchoidal and shining, 

 destitute of any lighter illinitions, being perfectly opaque. 



