Calendar: 1871-1872 Page 289

288 EVENING CLASSES Deduction of empirical and rational formulae-Oxidation of Ammonia Compounds of Nitrogen and Oxygen -Nitric Acid- Manufacture from Saltpetre-Its oxidising properties- Action upon metals and organic substances-The Nitrates- Nitric Anhydride-Derivation of the other Oxides of Nitrogen from Nitric Acid-The Oxides of Nitrogen as illustrating com- bination in multiple proportions by weight and volume Chlorine -Extraction of Chlorine from Salt-Its great chemical activity-Application of Chlorine for Bleaching and Disinfecting Hydrochloric Acid -Its action upon Metals and their Oxides-Molecular types-Atomicity of the elements Compounds of Chlorine and Oxygen -Their oxidising properties-Chlorate of Potash Bromine -Its extraction from mineral waters Iodine -Preparation from Sea-weed Fluorine -Difficulty in isolating it-Hydrofluoric Acid its corrosive action upon glass Fluoride of Silicon- Gradational relations among elements illustrated by the group of elementary halogens Sulphur -Important metallic ores containing Sulphur- Refining of Sulphur Allotropic varieties-Sulphuretted Hydrogen-Its use in analysis Compounds of Sulphur and Oxygen -Sulphurous Acid- Its bleaching and antiseptic uses Sulphuric Acid -Manufacture of Oil of Vitriol-Its de hydrating properties-Action upon Metals use for parting Gold and Silver-Preparation of Vegetable Parchment Sulphuric Anhydride The Sulphates Hyposulphite of Soda its application in Photography Bisulphide of Carbon -Its useful applications Phosphorus -Distribution in Nature Extraction from Bones-Vitreous and red modifications-Lucifer-matches Compounds of Phosphorus and Oxygen Phosphoric Anhydride-Hydrates of Phosphoric Acid-Orthophosphates Pyrophosphates and Metaphosphates