Calendar: 1891-1892 Page 198

ENGINEERING Natural Forms of Water -Rain Spring Saline and Mineral Waters Hard and Soft Waters Sea Water Boiler incrns- tations Formation of Calcareous Deposits in Nature Pro- cesses for softening Waters Action of Water upon Lead Organic Matter in Waters how to decide upon the character of Water-supply Purification of Water Distillation Hydrogen Dioxide -Its preparation and properties Ozone ד- £ Chlorine -Theory of bleaching Hydrochloric Acid Oxides and the following oxy-acids of chlorine viz Hypochlorous chloric and per-chloric acids preparation properties and composition of Composition and preparation of bleaching powder Bromine and hydrobromic and bromic acids Iodine and hydriodic iodic and periodic acids Iodides Fluorine -Hydrofluoric acid Etching on glass Sulphur --Its properties occurrence in nature and alio- tropic modifications Sulphuretted hydrogen mode of preparation properties and composition of Oxides of sulphur modes of preparation properties and composition of Sulphurous acid and the sulphites Sulphuric acid and the sulphates properties and composition of tests Nitrogen -Its functions in the Atmosphere Determination of the proportions of Nitrogen and Oxygen in Air Ammonia -Valuation of Nitrogenized Manures Formation of Saltpetre Nitrification Nitric Acid Preparation Uses of Nitric Acid in assaying and analysis of metallic alloys Preparation of Gun Cotton Fulminate of Mercury Nitroglycerine Nitrobenzol Picric Acid Nitrates Gunpowder Nitrogen Oxides Phosphorus -Its sources and its allotropic modifications its hydrides chlorides and oxides Phosphoric acids and the phosphates Hypophosphorous and phosphorous acids