vi TABLE OF CONTENTS. 



the Indian Ocean, 162 ; Magnetic Map of France, 162 ; on the Deviation 

 of the Compass, 162 ; Deviation of the Compass in Iron Ships, 163 ; New 

 Eelation between Electricity and Light, 163; Electricity from Dipping 

 Metals in Fluids, 163 ; Priority of Discovery of the Principle of the Gramme 

 Machine, 164 ; the Gramme Electric Machine, 165 ; a New Theory of Gal- 

 vanic Resistance, 165 ; on the Influence of Light upon the Conductivity of 

 Crystalline Selenium, 166 ; Conduction of Electricity by Compounds of 

 Sulphur, 166 ; on the Glow due to Galvanic Currents, 166 ; Curious Elec- 

 trical Light, 167 ; Phenomena attending Electric Discharges, 167; Duplex 

 Telegraphy, 168; the Double-balance Method in Duplex Telegraphy, 169; 

 Schwendler's Method in Duplex Telegraphy, 169; New Electric Appara- 

 tus for Railroads, 170; East Indian Telegraphy, 170 ; Curious Japanese Cora- 

 pass, 188; Claraond's Thermo-electric Battery, 189; Magnetism of Cobalt 

 and Nickel, 192. 



D. CHEMISTRY AND METALLURGY (Ixx) 193 



Hon-metallic Elements Wate?^: Decomposition of Water, 195; Decom- 

 position of Water by Platinum, 195 ; Cryohydrates, 195 ; Hydrogen: Oc- 

 cluded H5'^drogen in so-called Explosive Antimony, 193; Natural Develop- 

 ment of Sulphuretted Hydrogen, 196; Ozone: Determination of Ozone in 

 the Air, 194; Non-oxidation of Carbonic Oxide by Ozone, 213; Thermo- 

 chemistry of Ozone, 216; Carbon: Carbon from the Roof of a Gas-retort, 

 19S; Liquid Carbon Dioxide in Mineral Cavities, 198 ; Carbon Monosul- 

 phide, 199 ; Bisulphide of Carbon as an Antiseptic, 207 ; on the Gases In- 

 closed in Coal, 209; on the Hydrocarbons of Coal Gas, 214; Nitrogen: Ac- 

 tion of Nitric Acid on Metals, 197; Schonbein's Test for Nitrates, 210; 

 Ammonia: Ammonia in Sulphuric Acid, 196; Ammonium Nitrite, 197; 

 Action of Nitric Acid on Metals, 197 ; Bromine: American Bromine, 194; 

 Sulphur: Carbon Monosulphide, 199; Bisulphide of Carbon as an Antisep- 

 tic, 207 ; a New Oxide of Sulphur, 211 ; Phosi^horus : Constitution of Phos- 

 phorus Oxychloride, 198 ; Arsenic: Medico-legal Examination of Arsenic, 

 217. 



Metallic Elements Sodium : Manufacture of Soda from Sea-weed, 200 ; 

 Zi>w: Desilverization of Argentiferous Zinc, 204; Cerium: Atomic Weight 

 of Cerium, 201; the Cerium Metals, 201; Cerium, Lanthanum, and Didy- 

 mium, 201; Iron and Steel: Experiments on Steel, 202; Influence of For- 

 eign Ingredients upon the Physical Properties of Steel, 202; Copper: On 

 the Fusibility, etc., of Alloj'S of Silver and Copper, 205 ; Silver : Desilveri- 

 zation of Argentiferous Zinc, 204 ; on the Fusibility, etc., of Alloys of Silver 

 and Copper, 205 ; Vanadium : Discovery of Vanadic Acid in Magnetic Iron, 

 198; Platinum: Pure Platinum and Iridium, 206; Corrosion of Platinum 

 Stills by Sulphuric Acid, 212; Osmium and Ii-idium : Osmium, 206; Gold: 

 A New Test for Gold, 205; Gallium, 203, 204; Alloys: On the FusibiHty, 

 etc., of Alloys of Silver and Copper, 205. 



Organic Chemistry Cyanogen: A New Class of Cj^anides, 199; Cai-- 

 holic Acid: Manufacture of Carbolic Acid, 207; Brucine and Strychnine : 

 Conversion of Brucine into Strychnine, 207 ; Oleandrine, 207 ; Hydrocellu- 

 lose,2l\; Coffee: Detecting Adulterations in Coffee, 208. 



Miscellaneous : Chemical Action of Solar Ravs, 193 ; Bisulphide of Car- 



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