MINERALOGY. 119 



kind are Platinum with its retinue. Between Copper and 

 Platinum nothing else can be introduced but Nickel and 

 Cobalt, as they are likewise difficultly fusible and tolerably 

 noble. They are thus the Inflammable metals. After 

 all these separations a great group is still left of the 

 carth-nietals or the difficultly fusible and ignoble. They 

 divide therefore without doubt according to the 4 earths. 

 If now iron approximates the argillaceous-earths, so will 

 those metals whose oxydes are distinguished by a striking 

 colour be regarded as talc-metals. Of tms kind are 

 Titanium, Chromium, Uranium, which crystallize moreover 

 into spiculae like hornblende, or into lamellae like mica. 

 These again being separated the silicious and calcareous- 

 metals remain for investigation. The former are those 

 which scarcely admit of being reduced ; the latter, on the 

 contrary, those which approximate to the noble, diffi- 

 cultly fusible metals, namely to platinum. It can hardly 

 be doubted that Tantalum is the silicious-metal. For the 

 calcareous-metals Sulphuret of Molybdenum is left, to 

 which Osmium seems to approximate. We have accord- 

 ingly the following genetic arrangement : 



A. Earth-Metals. 



(Difficultly fusible and ignoble.) 



1. Silicious-Metals . . Tantak'um. 



2. Argillaceous-Metals . Wolfram, Cerium, Manganese, Iron. 



3. Talcose-Metals . . Titanium, Chromium, Uranium, Vanadium. 



4. Calcareous-Metals . Molybdenum, Osmium. 



B. Class-Metals. 



(Difficultly fusible and noble.) 



5. Salt-Metals. . . . Copper. 



6. Inflammable-Metals . Nickel, Cobalt. 



7. Ore-Metals .... Platinum, Palladium, Indium, Rhodium. 



C. Element-Metals. 



(Easily fusible or noble.) 

 S. Water-Metals . . . A-atimony, Lead, Tin. 

 9. Air-Metals .... Zinc, Cadmium, Bismuth, Arsenic. 

 10. Fire-Metals .... Tellurium, Mercury, Silver, Gold. 



