Calendar: 1870-1871 Page 291

290 evening classes Hydrochloric Acid -Its action upon Metals and their Oxides-Molecular types-Atomicity of the elements Compounds of Chlorine and Oxygisn -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 Sulphate3 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 Compounds of Phosphorus and Hydrogen -Preparation of the spontaneously inflammable Phosphoretted Hydrogen- Chlorides of Phosphorus