Increase in the Flood Waters in the Cultivated Lands, 101.-The Ocean:
Secular Changes in the Level of the Ocean, 70; New Generalization in
Ocean Physics, 72; the Challenger Observations on the Deep-sea Bottom,
73; Photographing the Waves, 103; Barometric Observations on the
Ocean, 104; so-called Tides in Great Lakes, 69; Tides of the Eastern
Aleutians and the North Pacific, 70; Influence of Winds upon the Tides,
73; on the Tides in the Roadstead of Fiume, 107; Tides of the Mediterra-
nean, 113; Origin of Ocean Currents, 71; the Circulation of Ocean Cur- rents, 71.-The Air. See Meteorology.
Meteorology in general: Nautical Meteorology, 76; Treatise on Meteor-
ology by Mohn, 78; Application of Amsler's Planimeter to Meteorological
Calculations, 79; Maritime Conference in London, 88; the Importance of
Meteorology, 90.-Climatology in general: Influence of Forests on Cli-
mate, 74; the Dry Season of Brazil, 79; Report of the Signal-Service Ob-
server on Pike's Peak, 80; the Frequency of Storms, 80; the Passage of
Storms to Europe from America, 80; Do Storms Cross the Atlantic? 112;
Cause of the Warm Climate of the West Coast of Norway, 81; Connection
between the Seasons and Human Mortality, 81; the Distribution of Thun-
der-storms, 82; Currents of Air within Cyclones and Waterspouts, 85;
the Temperature of Stormy Winds, 88; on Atmospheric Pressure, Winds
and Rain, 89; Secular Changes of Climate, 90; Meteorology in New South
Wales, 91; Connection of Weather and Colliery Explosions, 114; Periodic-
ity of Hail-storms, 116; Climatology of Florida, 117.-Weather Signals
and Predictions: Daily Weather Charts, 113.-Atmospheric Electricity:
see Electricity (PHYSICS); Atmospheric Electricity, 97; Figures made by
Lightning, 117; Lightning-conductors, 156; Atmospheric Electricity in
Spitzbergen, 157.-Atmospheric Pressure and the Winds: on the The-
ory of Tornadoes and Waterspouts, 77; the Progressive Movement of
Areas of Cold Air, 85; Carbonic-acid Gas in the Air, 92; Barometric Ob-
servations on the Ocean, 104; on the Distribution of Barometric Pressure
in European Russia, 105.-Temperature: the Penetration of Cold Air
into the Earth, 86; Glaciation of Iceland, 113; Periodicity of Severe
Winters, 115.-Moisture: Rainfall and Solar Spots, 79; Mirage, 83; Aque-
ous Vapor in the Atmosphere, 87; Periodicity of Rainfall, 87; on the Secu-
lar Diminution in Europe of Springs, Rivers, and Streams with the Simul-
taneous Increase in the Flood Waters in the Cultivated Lands, 101; the
Destructive Floods in Southern France, 98; the Diurnal and Annual
Periodicity of the Moisture in Russia, 108; the Hourly Distribution of
Rainfall, 114.-Instruments: a New Barometer of Large Scale, 83; the
New Self-recording Barometer, 84; a very Delicate Barometer, 86; the
New Anemoscope, 87; the Small Oscillations of the Barometer, 104; on
the Accuracy of Anemometers, 108; the Self-registering Barometer of
Redier, 111.
by the Microscopic Photograph, 123; Chemistry and Thermotics, 125;
Continuity of the Liquid and Gaseous States of Matter, 125; the Forces
developed by Evaporation and Condensation, 126; the Heat produced by
Galvanic Currents, 126; the Molecular Constitution of Gases and Liquids,
127; Compressibility of Water, 145; the Friction and Thermal Conductiv-
ity of Gases, 169; the Connection between Fluorescence and Absorption,
170; the Isochronism of the Balance Spring, 171; Attraction, Repulsion,
and Radiation, 173; Rood's Application of Zöllner's Horizontal Pendulum,
174; the Elasticity of Bars of Iceland Spar, 175; a New Manometer, 176;
the Physical Properties of Matter in the Liquid and Gaseous States, 176;
on the Influence upon the Movement of a Pendulum of a Fluid contained
in its Spherical Bob, 177; Flow of Air through Orifices, 186.
Sound (see also p. xlix): Reflection of Sound from a Layer of Flame or
Heated Gas, 128; New Method of Observing the Vibrations of a Tuning-
fork, 130; the Action of Organ-pipes, 131; Effect of the Movement of the
Observer on Sound and Light, 131; the Theory of Resonators, 132; Vibra-
tions of Membranes, 132; the Cause of Wolf in the Violincello, 179; the
Pyrophone, 179; Ancient Musical Instrument in China, 202; Remarkable
Improvements in Stringed Instruments, 203; Harmony in Musical Instru-
ments, 204.-Fog-signals: the Gas-gun for Fog-signals, 129; Steam Fog-
whistles, 129; a New Fog-signal, 130; Relative Efficiency of Various Fog-
signals, 180; Fog-signals, 181.
Light (see also ASTRONOMY for Spectroscopy, and p. lix): the Spectra
of the Least Fusible Metals, 133; the Cause of the Variation of Gaseous
Spectra, 133; a Simple Spectroscope for Stars, 133; the Beginnings of
Spectrum Analysis, 134; Spectra of Certain Rarer Metals, 134; Effect of
Temperature and Pressure on the Spectrum Lines, 135; New Tables of
Spectrum Lines, 135; Advantageous Construction of the Spectroscope,
136; Abbe's Refractometer, 136; the Cause of the Luminosity and Non-
luminosity of Flames, 136; Flame of Burning Glycerine, 137; a Perfectly
Monochromatic Sodium Flame, 137; an Apparatus for Illustrating the
Mechanical Effects of Light, 137; on the Intensity of the Light Reflected
from Glass, 138; the Fixed Stars as Visible through Minute Apertures,
139; the Opacity of Photographic Images, 140; on Wave Surfaces in
Optics, 140; on Optical Phenomena at the Transit of Venus, 142; the
Color of Diamonds, 144; Gilt-edged Prism in the Construction of the
Camera-lucida, 144; the Reflection of Light, 146; the Action of Light
upon Chlorophyl, 146; Experiments on the Velocity of Light, 147;
Automatic Registration of the Chemical Action of Light, 148; New Method
of Measuring the Velocity of Light, 149; the Power of the Electric Light,
150; Electric Light for Locomotives, 151; the Connection between Flu-
orescence and Absorption, 170; the Spectroscope with a Fluorescent Ocular,
138; Accidental or Subjective Colors, 189; Reflection of Thin Films, 191;
Elliptic Polarizations of Light, 140; a New Class of Absorption Phenomena,
141; the Phosphorescence of Phosphorus, 141; Great French Light-house
at La Havre, 149; the Roman Pharos in Dover Castle, 150; New Pho-
tometers, 145; on Celestial Photometry, 182; Recent Improvements in the
Microscope, 188; Testing Microscope Object-glasses, 189; on the Phenom-
ena of Diffraction Produced by Circular Net-work, 143.
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; the 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 Leclanché
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,
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
by the Microscopic Photograph, 123; Chemistry and Thermotics, 125;
Continuity of the Liquid and Gaseous States of Matter, 125; the Forces
developed by Evaporation and Condensation, 126; the Heat produced by
Galvanic Currents, 126; the Molecular Constitution of Gases and Liquids,
127; Compressibility of Water, 145; the Friction and Thermal Conductiv-
ity of Gases, 169; the Connection between Fluorescence and Absorption,
170; the Isochronism of the Balance Spring, 171; Attraction, Repulsion,
and Radiation, 173; Rood's Application of Zöllner's Horizontal Pendulum,
174; the Elasticity of Bars of Iceland Spar, 175; a New Manometer, 176;
the Physical Properties of Matter in the Liquid and Gaseous States, 176;
on the Influence upon the Movement of a Pendulum of a Fluid contained
in its Spherical Bob, 177; Flow of Air through Orifices, 186.
Sound (see also p. xlix): Reflection of Sound from a Layer of Flame or
Heated Gas, 128; New Method of Observing the Vibrations of a Tuning-
fork, 130; the Action of Organ-pipes, 131; Effect of the Movement of the
Observer on Sound and Light, 131; the Theory of Resonators, 132; Vibra-
tions of Membranes, 132; the Cause of Wolf in the Violincello, 179; the
Pyrophone, 179; Ancient Musical Instrument in China, 202; Remarkable
Improvements in Stringed Instruments, 203; Harmony in Musical Instru-
ments, 204.-Fog-signals: the Gas-gun for Fog-signals, 129; Steam Fog-
whistles, 129; a New Fog-signal, 130; Relative Efficiency of Various Fog-
signals, 180; Fog-signals, 181.
Light (see also ASTRONOMY for Spectroscopy, and p. lix): the Spectra
of the Least Fusible Metals, 133; the Cause of the Variation of Gaseous
Spectra, 133; a Simple Spectroscope for Stars, 133; the Beginnings of
Spectrum Analysis, 134; Spectra of Certain Rarer Metals, 134; Effect of
Temperature and Pressure on the Spectrum Lines, 135; New Tables of
Spectrum Lines, 135; Advantageous Construction of the Spectroscope,
136; Abbe's Refractometer, 136; the Cause of the Luminosity and Non-
luminosity of Flames, 136; Flame of Burning Glycerine, 137; a Perfectly
Monochromatic Sodium Flame, 137; an Apparatus for Illustrating the
Mechanical Effects of Light, 137; on the Intensity of the Light Reflected
from Glass, 138; the Fixed Stars as Visible through Minute Apertures,
139; the Opacity of Photographic Images, 140; on Wave Surfaces in
Optics, 140; on Optical Phenomena at the Transit of Venus, 142; the
Color of Diamonds, 144; Gilt-edged Prism in the Construction of the
Camera-lucida, 144; the Reflection of Light, 146; the Action of Light
upon Chlorophyl, 146; Experiments on the Velocity of Light, 147;
Automatic Registration of the Chemical Action of Light, 148; New Method
of Measuring the Velocity of Light, 149; the Power of the Electric Light,
150; Electric Light for Locomotives, 151; the Connection between Flu-
orescence and Absorption, 170; the Spectroscope with a Fluorescent Ocular,
138; Accidental or Subjective Colors, 189; Reflection of Thin Films, 191;
Elliptic Polarizations of Light, 140; a New Class of Absorption Phenomena,
141; the Phosphorescence of Phosphorus, 141; Great French Light-house
at La Havre, 149; the Roman Pharos in Dover Castle, 150; New Pho-
tometers, 145; on Celestial Photometry, 182; Recent Improvements in the
Microscope, 188; Testing Microscope Object-glasses, 189; on the Phenom-
ena of Diffraction Produced by Circular Net-work, 143.
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; the 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 Leclanché
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.
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
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