SUPPLEMENT. 



pectedly been found at great depths. Born 

 assures us that petrified porpites (a kind of mol- 

 lusk), have been repeatedly found in a mine of 

 Hungary, at the depth of 89 fathoms, or 534 feet. 

 Fichtel has also observed, in his work on the Car- 

 pathian mountains, that in the mines of Hungary 

 has been found a fungite as large as a nut, the pa- 

 rallel leaves containing a little ball enchased in 

 the interior, the substance being now spathose iron, 

 of a deep brown; and it rests on crystallised 

 quartz, covering the decomposed porphyry, called 

 saxum metalliferum by Born, and here styled 

 bornite, in honour of that great mineralogist. 

 There was also found a bivalve shell, of the size of 

 a filbert, likewise placed on quartz and bornite. 

 The two valves were separated from each other, 

 but entire. Fichtel adds, that he has in his pos- 

 session a cochlite, or sea-snail, found in a vein of 

 gold in Transilvania*. Might not even these 

 relics arise from subterranean waters ? 

 Decomposed Finally, among veinstones may also be classed 

 those decomposed rocks, generally occurring in 

 the proximity of metallic veins, and which having 

 a more immediate relation to the present work, 

 must be treated with some detail. 



* Werner, Theorie, 89, 280, 



