_déferlement_, theory of, 155; explanation of, 155 _et seq._;
temperature involved in, 156.
Deimos, dimensions of, 177; orbit of, 577.
De Lapparent, exotic nature of the Préalpes, 150.
De Montessus and the association of earthquakes with
geosynclines, 142.
Denudation as affected by continental elevation, 17; factors
promoting, 30 _et seg._; relative activity in mountains and on
plains, 35-40; solvent, by the sea, 40; the sodium index of,
46-50; thickness of rock-layer removed from the land, 51.
De Quincy, System of the Heavens, 200.
Dewar, Sir James, latent image formed at low temperatures, 202.
Dixon, H. H., and AGnadance of Life, 60.
Double canals, formation by attraction of a satellite, 585-187.
Douglass, A. E., observations on Mars, 167.
Dravidian Era of India, 135.