462 APPENDIX. Class H—INCOMBUSTIBJLES. Oxidised Minerals, and Combinations of these. 1. Order. Oxides. 1. Sub-Order. Metallic Oxides. Oxidised Metals, either simple, or in combination with each other, and sometimes also combined with earths or with water,—Ex. Magnetic Ironstone, and Brown Iron stone. 2. Sub-Order. Earths, variously combined with each other, and with metallic oxides and water. 1. Series. Simple, Quartz. Indeterminate combinations of earths with each other, or with other matters. 2. Series. Compound, Opal. v Determinate combinations of earths with each other, or with other substances. 2. Order. Oxydoide. Combinations of combustible bodies with oxygen, which possess neither the properties of bases nor of acids. —Ex. Water. 3. Order. Acips. 4. Order. Salts. Combinations of Bases with Acids. 1. Sub-Order. Earthy. With Earthy Bases, i. Series. Aluminous Salts. 2 - Magneaian Salts. 2. Sub-
