Heat-tendency of the universe, 62.

Heat emission from the Earth’s surface, 126; from average igneous rock due to radioactivity, 126.

Helium and the alpha ray, 214, 222; colouration of halo not due to, 236.

Hering, E., and physiological or unconscious memory, 111.

Herschel and Babbage theory of mountain building, 123.

Herschel, Sir W., on galaxy of milky way, 293.

Hertz, negative electrification discharged by light, 204.

Himalaya, geological history of, 134-139.

Hobbs, on association of earthquakes and geosynclines, 143.

Holmes, A., original lead in minerals, 20; age of Devonian, 21.

Horst concerned in Alpine deferlement, objections to, 156.

Hyperion, dimensions of, 177.

I.

Ice, melting of, by pressure, 267 et seq.; expansion of water in becoming, 267; lowering of melting-point by pressure, 267; fall of temperature under pressure, 268 et seq.; viscosity of, 284.

Igneous rocks, average composition of, 43.

Inanimate actions, dynamic conditions of, 61.

Inanimate systems, secondary effects in, 63-65; transfer of energy into, 66.

Indian geology, equivalent nomenclature of, 139.

Initial recombination of ions due to alpha rays, 221, 222, 231; and structure of the halo, 231.

Insect life in the higher Alps, 104, 105; destruction of, on the
Alpine snows, 106.

Ionisation by alpha ray, density of, 221; importance in chemical actions, 250; in living cell, 250.

Ions, number of, produced by an alpha ray, 237.

Isostasy, 53; and preservation of continents, 53.

Ivy, inconspicuous blossoms of, 107; delay in ripening seed, 107.

K.

Kant and Laplace, material hypothesis of, does not account for the past, 290.

Kelvin, Lord, experiment on effects of pressure on ice, 268-270.

Kleeman and Bragg.  See Bragg.

Klopstock introduces skating into Germany, 273.

L.

Lakes, cause of blue colour of, 55.

Land, movements of the, 53, 54.

Laukester, Ray, the soma and reproductive cells, 85.

Lapworth, structure of the Scottish Highlauds, 153.

Latent heat of water, 266.

Latent image, formed at low temperatures, 202; Bose’s theory of, 203; photo-electric theory of, 204, 209 et seq.

Least action, law of, 66.

Lembert and Richards, atomic weight of lead, 27.

Length of life dependent on conditions of structural development, 93; dependent on rate of reproduction, 94.

Life-curves of organisms having different activities, 92.

Life, length of, 91.

Life waves of a cerial, 95; of Ausaeba, 87; of a species, 90.