Calendar: 1871-1872 Page 297

296 EVENING CLASSES XIV Electro-Magnets Work done by Electro-Magnetic Machines The Electric Telegraph Testing of Submarine Cables Thomson's Reflecting Galva- nometer XV Induction by Currents and by Magnets Laws of Induced Currents RuhmkorfFs Coil Geissler's Tubes Magneto-Electrical Machines 24 MINERALOGY Day and Hour of Attendance-Thursday from to The Course will commence with description of the Physical and Chemical characters of Minerals in General Physical --Crystallization Cleavage Fracture Frangibi- lity Hardness Lustre Colour Flexibility Double Refraction Touch Taste Odour Streak Powder Adhesion to the Tongue Magnetic and Electric Properties Phosphorescence Specific Gravity Chemical -Use of the Blowpipe Action of Acids &c The principal simple Minerals will next be separately con- sidered and the readiest mode of distinguishing them described The following is the order adopted Earthy Minerals -Rock Crystal Amethyst Cairngorm Avanturine Cat's-eye Opal Chalcedony Flint Onyx Agate Carnelian Heliotrope Jasper Hornstone Chert Garnets Idocrase Axinite Epidote Augite Hornblende Asbestos Tremolite Actinolite Felspars Zeolites Mica Talc Chlorite Calcite Fluor Selenite Barytes Strontian Salt Cryolite Combustible Minerals -Sulphur Bitumen Coal Jet Amber Sec Minerals used in Jewelry -Diamond coloured varieties of Corundum Sapphire Ruby Topaz-called Oriental stones Spinel Turquoise Topaz Emerald Beryl Hyacinth Tourma- line Lapis-lazuli &c