Light, effects of, in discharging negative electrification, 204; chemical effects of, 205; experiment showing effect of, in discharging electrified body, 205.

Lindemann, Dr., duration of solar heat, 29.

Lowell, Percival, observations on Mars, 167 et seq.; map of
Mars, reliability of, 198.

Lucretius, birth-time of the world, 1.

Lugeon, formation of the Prealpes, 171; sections in the Alps, 154.

Lyell, uniformity in geological history, 15.

M.

Magee, relative areas of deposition and denudation, 16.

Mars, climate of, 170; position in solar system, 174, 175; dimensions of satellites of, 177; snow on, 169; water on, 169; clouds on, 169; atmosphere of, 170; melting of snow on, 170; dimensions of canals, 171; signal on, 172; times of opposition, 164; orbit of, 165; distance from the Earth, 165; eccentricity of his orbit, 165; observations of, by Schiaparelli, 165, 166; Lowell’s observations on, 167 et seq.

Maxwell, Clerk, changes made under constraints, 65; on conservation of energy, 61.

M’Connel, J. C., viscosity and rigidity of ice, 284.

Memory, physiological, 111, 112.

Metamorphism, thermal, in Alpine rocks, 132, 149

Millicurie, definition of, 256.

Molasse, accumulations of, 148.

Morin, coefficients of friction, 265.

Morphy, H., experiments on coefficient of friction of ice, 281.

Mountain-building and the geosynclines, 119-121; conditioned by radioactive energy, 125; energy for, due to gravitation, 122; reduction of surface attending, 123; depression attending, 123; instability due to thermal effects of compression, 132; igneous phenomena attending, 132; rhythmic character of, accounted for, 133; movements confined to upper crust, 122; movements due to compressive stresses in crust, 122; movements, rhythmic character of, 121.

Mountain ranges built of sedimentary materials, 118.

Mueller, J., coefficient of friction of skate on ice, 265, 274.

Muth deposits of India, 135.

N.

Newton, Professor, of Yale, on origin of Mars’ satellites, 177.

Nucleus, dimensions of, 237; amount of radium in, 238.

Nummulitic beds of Himalaya, 138.

O.

Ocean, amount of rock salt in, 50; cause of black colour of, 55; estimated mass of sediments in, 48; increase of bulk due to solvent denudation, 52; its saltness due to denudation, 41.

Old age and death, 82-85; not at variance with progressive activity, 83.

Organic systems, origin of, 78.

Organic vibrations, 86 et seq.

Organism and accelerative absorption of energy, 79; and economy, 109-111; and periodic rigour of the environment, 94,95.

Organism and sleep, 95; ultimate explanation of rythmic events in, 96, 97; law of action of, 68 et seq.; periodicity of; and law of progressive activity, 82 et seq.