MINERALOGY. 



115 



have had recourse only to those combustible bodies which 

 occur accidentally in the earth, while according to philo- 

 sophical principles everything belongs to the province of 

 natural history, that has originated or may originate in 

 nature, so that its situation is a matter of complete 

 indifference. If we follow the same laws according 

 to which the earths and salts have been so excellently 

 arranged, we must here also adopt four orders, namely, 

 combustible things which bear a resemblance to earths, 

 others to salts, others to metals; finally, others which 

 represent combustibility in a pure state, and thus we 

 obtain 



if 



1. Earth-Inflammables . . . Coals. 



2. Salt-Inflammables . . . Fats. 



3. Inflammable-Inflammables Resins. 



4. Ore-Inflammables . . . Colouring matters. 



The Earth-inflammables will be such as are solid and 

 burn, without becoming fluid, e. g. Common Coal. The 

 Salt-inflammables will either be or become fluid before 

 they undergo combustion, and are readily converted of 

 themselves into acids, e. g. Animal and Vegetable Eats. 

 The Inflammable-inflammables will be of a sulphurous 

 character, solid or fluid, fragile, electric, fetid and fluid 

 before they burn. These properties are found in the 

 Resins. The Ore-inflammables are those which, inde- 

 pendently of their combustibility, possess preeminently 

 one property of metals, namely their non-transparency, 

 or coloration, e. g. the Pigments or colouring matters 

 from the organic kingdoms. 



ORDER I. 

 Earth-Inflammables -.Coals. 



1 4. Earth-Coals . . Common-coal, a mixture of coal and earths. 



5. Salt-Coals . . . Gunpowder, viz. a combination of charcoal 



with a salt. 



6. Inflammable-Coals Glance -coal, viz. carbon without earths. 



. Black-lead^ or carburet of iron. 



. Peat-bog and brown or Common coal ? 



. Lignite or wood-coal ? 



. Animal carbon, fibrine. 



7. Ore-Coals 



8. Water-Coals 



9. Air-Coals . 

 10. Fire-Coals . 



