ORDER III. _Inflammable-Salts--Saponaceous-compounds._ (Soluble, and at the same time combustible bodies.) 1-4. Earth-Soaps Calcareo-sulphuret of potash. 5. Salt-Soaps Common sulphuret of potash. 6. Inflammable-Soaps Fatty or soft soaps. 7. Metallic-Soaps Metallic Soaps. 8. Water-Soaps Animal mucilages. 9. Air-Soaps Saccharum or sugar. 10. Fire-Soaps Vegetable extracts. ORDER IV. _Ore-Salts--Vitriols._ (Combinations of acids with metals.) 1-4. Fluoric-acid 5. Boracic-acid 6. Sulphuric-acid Iron, Copper, Zinc, Vitriol. 7. Arsenic-acid White arsenic. 8. Hydrochloric-acid Calomel, Corrosive sublimate. 9. Nitric-acid Nitrate of silver. 10. Carbonic-acid Sugar of lead. _CLASS III._ AIR-EARTHS--INFLAMMABLES. 542. It is very difficult to arrange this class, because it has been wholly neglected by mineralogists, and is, properly speaking, quite unknown to them, because they have had recourse only to those combustible bodies which occur accidentally in the earth, while according to philosophical 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-- 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 Fats. 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, independently of their combustibility, possess pre-eminently 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. 7. Ore-Coals Black-lead, or carburet of iron. 8. Water-Coals Peat-bog and brown or Common coal? 9. Air-Coals Lignite or wood-coal? 10. Fire-Coals Animal carbon, fibrine.