NOME V SIDERITE, WITH SILEX. 3J) 



The term diamictonic, derived from the 

 Greek, implies that two or more substances 

 are so thoroughly mingled, or, in the lan- 

 guage of chemistry, so intimately com- 

 bined, that the rocks cannot be arranged 

 under either Domain, either from prepond- 

 erance or predominance. 



As this Domain depends especially upon 

 the guidance of chemistry, it may be chosen 

 to honour the names of the chief chemists, 

 here arranged in chronological order, from 

 the most ancient to the most modern 

 times*. 



NOME I. SIDERITE, WITH SILEX. 



[HERMITE, from Hermes, the supposed founder 

 of chemistry, which certainly originated in 



Of this kind is the celebrated rock above 

 mentioned, in which atoms of quartz are inti- 

 mately blended with atoms of siderite ; but in 



* A curious account of the ancient chemists, or alchemists, may 

 be found in the Histoire de la Philosophic Hermetique of Lenglet 

 Dufresnoy, Paris, 1742, 3 vols. 12mo. 



