47.

Heat,
amount of, daily escaping from the earth, 89;
amount of, falling from the sun on the earth, 41;
belief of the ancients regarding, 42;
dominating effect on air currents of tropical, 104;
energy with which it leaves the sun, 41;
internal,
of the earth, 88, 89;
of the earth's interior, 309, 310;
sun, effect on the atmosphere of the, 100;
Prof. Newcomb's belief regarding the, of the sun, 52;
radiation of the earth's, causing winds, 101;
solar, 41;
tropical, and air currents, 104.

Hills, sand, 123.

Horizontal pendulum, 384.

Horse latitudes, 104.

"Horses," 261.

Hurricanes, 107, 110, 317;
commencement of, 107;
doldrum of, 109;
felt near the sea, 110;
in the tropics, 110.

Hypothesis,
nebular, 34, 35, 39, 52, 56;
working, 4, 5.

Ice action,
effect of intense, 222, 223;
in forming glaciers, 230, 232;
recent studies in Greenland of, 239;
depth of, in Greenland, 227;
effect of, on river channels, 196;
effect of, on stream beds, 196;
expanding when freezing, 237;
epoch, 92, 93, 246;
floating, 242;
made soils rarely fertile, 241;
mass, greatest, in Greenland, 226, 227;
moulded by pressure, 215;
streams,
continental, 225, 226;
of the mountains, 225;
of the Himalayan Mountains, 234.

Icebergs, 242, 243;
indicating oceanic currents, 243.

Iceland, volcanic eruptions in, 297, 298.

Instruments, first, astronomical, 10, 11.

Inventions, mechanical, aiding science, 22.

Islands, 84, 272;
continental, 84;
in the deeper seas made up of volcanic ejections, 272;
volcanic, 272.

Jack-o'-lantern, 167.

Jupiter,
gaseous wraps of, 97;
path of the earth affected by, 59, 60;
the largest planet of the sun, 69.

Kames, 325.

Kant, Immanuel, and nebular hypothesis, 34.

Kaolin, 324.

Klondike district, cold in, 243, 244.

Krakatoa,
eruption of, 298-300;
effect of, on the sea, 299;
effect of, on the sun, 300.

Lacolites, 306.

Lacustrine beds, 351.

Lagoons, salt deposits found in, 200.

Lake basins,
formation of, 200, 201;
bogs, 331, 333, 334;
deposits, 350, 351.

Lakes,