5. Halo-calcareous earths Boracite. 6. Inflammable- " Phosphate of lime, Fluorspar? 7. Ore- " Titanite, Tungsten. C.--_Elemental-Calcareous earths._ 8. Water calcareous earth Hydrophyllite? Wavellite. 9. Air- " Gypsum, Heavy-spar, Celestine. 10. Fire- " Limestone. Here also the first 7 tribes only occur crystallized, the 3 last, in a great measure, compact, and as mountainous masses. _CLASS II._ WATER-EARTHS. SALTS. 541. The chief distinctions of the salts consist also in their combination with the other classes, and we have therefore 4 orders-- 1. Earth-Salts Double-salts. 2. Saline-Salts Neutral-salts. 3. Inflammable-Salts Saponaceous-compounds. 4. Metallic-Salts Vitriols. The same will hold good without doubt of the orders, as in the case of the earths. They form as many families as there are principal masses of them present, with which they may combine. As the acids, from being the children or offspring of water, play the chief part in the water minerals, and are themselves nothing else than oxydized and outwardly lying masses, they carry consequently within themselves the number and import of the families; thus it is they which determine indeed the division. If the bases were to be taken as the groundwork of arrangement, there would be only earths and alkalies, and on the other hand numerous metals, by which step the mineralogist would fall into the unprincipled method of classification adopted by empirics. Here also the philosophy of nature shows, and that indeed upon sound reasoning, that the acids and not the bases afford the principle of a natural classification. A somewhat different opinion is held by the chemist, who must characterize the salts according to both series; but this is by no means the course taken by the historian of nature. ORDER I. _Earth-Salts--Double Salts._ (Combinations of acids with earths.) Fam. 1-4. Earthy-acids or Fluoric-acid earths; here also belong Bromic, Iodic, and Cyanic acids. 5. Salt or Boracic-acid. 6. Inflammable or Sulphuric-acid--Alum, Sulphate of magnesia. 7. Metallic or Arsenic-acid. 8. Water or Hydrochloric-acid--the earths Barytes, Strontian, and Lime; Murias ammoniæ, Chloride of Calcium. 9. Air or Nitric-acid--Strontium, Nitrate of lime. 10. Fire or Carbonic-acid--Vegetable-acid earths. Order II. _Salt-Salts--Neutral Salts._ (Combinations of acids with alkalies.) 1-4. Fluoric-acid 5. Boracic-acid Borax. 6. Sulphuric-acid Sulphate of soda, Sulphate of potash. 7. Arsenic-acid. 8. Hydrochloric-acid Rock-salt, Muriate of soda, Sal-ammoniacum or salmiac. 9. Nitric-acid Nitrate of potash or saltpetre, Cream of tartar. 10. Carbonic-acid Soda, Subcarbonate of potash, Binoxalate of potash, Acetate of potash.