d by weight, 93;
deviation of the path of the, varied, 61;
diameter of the, 82;
of the, affected by loss of heat, 131;
difference in altitude of the surface of the, 83;
discovery that it was globular, 31, 32;
effect of imaginary changes in the relations of sun and, 59;
effect of the interior heat of the, 309, 310;
effect of the sun on the, 60, 61;
formerly in a fluid state, 82;
imaginary view of the, from the moon, 81;
important feature of the surface of the, 83;
jarring caused by faults, 367;
surface of the, determined by heat and light from the sun, 57;
most important feature of the surface of the, 83;
motion of the, affecting the direction of trade winds, 103;
movements, 366;
natural architecture of the, 377;
no part of the, exempt from movement, 384;
parting of the moon and, 396;
path of the, around the sun, 55, 56, 59, 60;
revolving from east to west, 103;
shrinking of the, from daily escape of heat, 89;
soil-covering of the, 343;
study of the, 81-96;
swaying, 385;
tensions, problem of, 371;
tremors, caused by chemical changes in the rocks, 385;
tropical belt of the, 74;
viewed from the surface of the moon, 311, 312;
water store of the, 125.

Earthquakes, 277, 278, 280, 356, 358, 370-384, 388-390;
accidents of, 358;
action of, 356;
agents of degradation, 383, 384;
basis of, 367;
certain limitations to, 380, 381;
Charleston, of 1883, 374, 375;
countries, architecture in, 381;
echoes, 369, 370;
damages of, 377, 390;
effect of,
on the soil, 375;
the surface of the earth, 371;
formed by riving of fissures, 382;
great, occurring where rocks have been
disturbed by mountain-building, 381, 382;
Herculaneum and Pompeii destroyed by an, 277, 280;
Italian, in 1783, 371, 372;
important, not connected with volcanic explosions, 381;
Jamaica, in 1692, 372, 376;
Lisbon, in 1755, 368, 369, 373, 374, 381;
maximum swing of, 369;
measuring the liability to, 386, 387;
mechanism of, 370, 371;
method of the study of, followed by Mr. Charles Mallet, 382, 383;
Mississippi, in 1811, 373, 374, 380, 381;
movement of the earth during, 377;
originating from a fault plane,