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.
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 Préalpes, 171; sections in the Alps,
154.
Lyell, uniformity in geological history, 15.