v i TABLE OF CONTENTS. 



Electricity, Atmospheric (see Meteorology) : Effect of Lightning 

 on Trees, 164; Discharge of Electrified Conductors, 179; Dielectric Ab- 

 sorption, 174; Conductivity of Metallic Vapors, 165; Synthesis by Electric 

 Action, 147 ; Electric Resistance of Selenium, 148 ; New Contact Theory of 

 the Galvanic Cell, 146; Improved Electric Light, 160; Measurement of 

 Galvanic Currents, 165 ; Effect of Current on Length of Conducting Wire, 

 167 ; General Effect of, on Magnetized Wire, 171 ; Distribution of Time by 

 Astronomical Observations, 147. 



Magnetism, Terrestrial Magnetism (see also Terrestrial Physics and 

 Meteorology) : Relation to Shrinkage of Earth, 52 ; Daily Variations in, 

 53; Magnetic Chart of the Northern Hemisphere, 154; Variation in Mag- 

 netic Declination, 158; Secular Changes in, 153; Earth Currents, 150, 172; 

 Solar Heat and Terrestrial Magnetism, 172 ; Calorific Effects of Opposing 

 Magnetisms, 148 ; Magnetization of Glass, 1 52 ; Molecular Theory of Mag- 

 netism, 153 ; the Armature in Magnets, 173 ; Discoveries of Archibald 

 Smith Relative to Ships' Compasses, 149 ; Compass Deviations, 149 ; New 

 Compass, 156 ; New Instruments, 126. 



D. CHEMISTRY AND METALLURGY (xliv) 199 



General: Metamerism in Inorganic Chemistry, 204; Mixture of Liquids 

 with Exclusion of Air, 202 ; Jacobsen's Apparatus for Extracting Gases 

 from Sea-water, 207 ; Hot Filtering, 214 ; Spectroscopic Chemistry, 214 ; 

 Assaying with the Spectroscope, 215; Explosion and Ignition by Perman- 

 ganate of Potash and Sulphuric Acid, 201. 



The Elements and their Simpler Combinations : The Gaseous, Liquid, 

 and Solid States of Water, 209 : Is Hydrogen a Metal? 200; Hydrogenous 

 Palladium, 199; the Occlusion of Hydrogen by Iron, 199; Safe Hydrogen 

 Generators, 213 ; Manufacture of Oxygen Gas, 200 ; the Action of Water 

 upon Ozone, 202 ; New Method of Forming Ozone, 203 ; Ozone and Ant- 

 ozone, 203 ; Action of Ozone on Benzole, 204 ; a New Experiment in Ozone, 

 204; Carbonic Acid in Air, 110; Solidification of Nitrous Oxide, 201 ; Quick- 

 silver Product of California in 1873, 208 ; Electrical Deposition of Iron, 208 ; 

 Phosphorus Steel, 210; the Density of Molten Iron, 210; Volatilization of 

 Iron, 211; Temperature in Pneumatic Steel-making, 217; Reducing Rich 

 Iron Ores, 217 ; Preparation of Aluminium, 211 ; Aluminium in Plants, 217 ; 

 Melting an Extraordinary Mass of Platinum, 211 ; Non-metaUic Elements 

 in the Solar Spectrum, 45. 



Organic Compounds : Artificial Vanilla, 204 ; Changes in Alcoholic Liq- 

 uors by Cold, 206 ; New Process for Estimation of Alcohol, 213 ; Detection 

 of Starch in Milk, 212; Quantitative Determination of Tannic Acid, 212; 

 Composition of Suint, 213; Detecting Fuchsine in Wine, 214; Action of 

 Elodea Canademis (Water-pest) on Cane Sugar, 206 ; Cause of Acetous 

 Fermentation, 208 ; Alcoholic Fermentation by Mould, 280. 



E. MINERALOGY AND GEOLOGY (lxv, lxvii) 219 



(a.) MINERALOGY. 



New Species : Tschermakite, 225 ; Horbachite, 226 ; Schrbckingerite, 226 ; 

 New Minerals, 235. Old Species: Native Tellurium in Colorado, 219; a 

 Bismuth Mine in France, 220 ; Beds of Sulphur in Iceland, 227 ; Dr. Genth 



