TABLE OF CONTENTS. vii 



Heat (see also p. liii) : Attraction and Repulsion Resulting from Radia- 

 tion, 119; Increased Radiation with Temperature, 119; Ebullition Phenom- 

 ena, 124; Relation between Chemistry and Thermotics, 125; the Heat 

 produced by Galvanic Currents, 126 ; tbe Thermal Conductivity of Mer- 

 cury, 152; on the Expansion of India Rubber by Heat, 154; on the Molec- 

 ular Heats of Similar Compounds, 155; on the Repulsion Due to Heat, 

 155; the Specific Heat and Cubic Expansion of Bodies, 156; the Variations 

 of Temperature accompanying the Diffusion of Gases, 172; the Freezing 

 of Salt Water, 194; the Black Bulb in Vacuum Thermometers, 151 ; a New 

 Source of Error with the Mercurial Thermometers, 152 ; Reliability of 

 Siemens's Pyrometer, 153 ; Siemens's Electrical Pyrometer and Differential 

 Voltameter, 191; a New Mercurial Thermometer Minimum and Maximum, 

 153; New Self-recording Thermometer, 154. 



Electricity (see also Meteorology, and p. lxxii) : the Transmission of 

 Mechanical Power by Means of Electricity, 122; the Evaporation of Metals 

 by Electricity, 128 ; the Power of the Electric Light, 150 ; Electric Light 

 for Locomotives, 151 ; Lightning Conductors, 156 ; Edlund's Theory of the 

 Nature of Electricity, 157; on the Electricity of Mineral Waters, 158; 

 the Stratification of Electric Discharges in Vacuo, 158 ; on Unilateral Con- 

 ductivity of Electricity, 159, 195 ; the Theory of the Electrical Machine, 

 199 ; the Electrical Conductivity of Ligneous Substances, 200 ; the Electric 

 Charge of a Conducting Wire, 159 ; the Action of Electricity on Phos- 

 phorus, 160 ; the Differences between Voltaic and Frictional Electricities, 

 160 ; on the Electric Discharge, 196 ; New Modification of the Leclanche 

 Battery, 161 ; Simple Method of Making Carbon Cells, 162 ; New Absolute 

 Galvanometer, 162 ; the Influence of a Magnet upon the Galvanic Arch, 

 166; Siemens's Electrical Pyrometer and Differential Voltameter, 191; 

 Singular Property of Aluminum Electrodes, 196; Telegraphic Ground- 

 currents, 197 ; the Electrical Voting Machine, 198. 



Magnetism (see also Terrestrial Physics and Meteorology, and 

 p. lxx) : On the Relation between Specific Gravity and Magnetism of Iron, 

 124; Velocity of the Transmission of Magnetic Force, 157; Earth-currents 

 on Telegraphic Lines, 159; the Formation of Magnets by Electrolysis, 164; 

 the Effect of Magnetism on the Electric Discharge, 165 ; Formation of 

 Magnetism by Electric Currents, 166 ; the Influence of a Magnet upon the 

 Galvanic Arch, 166 ; New Source of Magnetism, 167 ; Magnetic Permea- 

 bility of Iron, Nickel, etc., 167 ; Improvements in the Gramme Magneto- 

 electric Machine, 168. Compasses : Variations of Ships' Compasses, 163 ; 

 Circular Magnetic Needles, 200; Corrections of the Compass on Iron Ships, 

 201. 



D. CHEMISTRY AND METALLURGY (lxxv) 205 



General : New Views of Chemical Affinity, 211 ; Water of Crystallization, 

 212; Microscopic Examination of the Process of Crystallization, 218; the 

 Incomplete Combustion of Gases, 219 ; Gases Occluded in Meteorites, 220 ; 

 Why does Plaster of Paris set? 224; Formation of Sulphate by Gas-flames, 

 228 ; Action of Weak Acids on Salts of Stronger Ones, 232. 



The Elements and their Simpler Combinations : Vanadium in Rocks, 

 205 ; Crystallized Cadmium, 205 ; Oxidation of Ruthenium, 205 ; Metallic 



