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.