boulder clay of Fermian age, 300

Age and origin of the sun, 316

Air, on absorption of rays by, 59

when humid, absorbs rays which agree
with it in period, 59

when perfectly dry incapable of ab-
sorbing radiant heat, 59

Airy, Professor, earth's axis of rotation per-
12nent, 7

Aitken's, Mr., experiment on density of polar
water, 129

Aland islands, striation of, 447

Alternate cold and warm periods, 236
Allermuir, striations on summit of, 441
Ameriea, low temperature in January, 72
thickness of ice-sheet of North, 381
Anderson, Captain Sir James, never observed
a stone on an iceberg, 252
Antarctic regions, mean summer temperature
of, below freezing point, 63

Antarctic ice-cap, probable thickness of,

Arctic, warm inter-glacial periods in, £53—

265

state of, during glacial period, 200
evidence of warm periods in, 261
occurrence of recent trees in, 261, 265
evidence of warm inter-glacial perioda

293

warm climate during Old Red Sand.
stone period in, 295

"glacial period during Carboniferous age
in, 297

warm climate during Permian period in,

301

list of

papers relating to, 558
Arctic Ocean, area of, 195

,, according to gravitation theory ought
to be warmer than Atlantic in torrid
zone, 195

heat conveyed into, by currents, com-
pared with that received by it from the
Sun, 195

blocked up with polar ice, 414
Armagh, boulder beds of, 290

Arran, Island of, glacial conglomerate of
Permian age in, 299

Astronomical causes of change of climate,

10

isothermal lines of, compared with
those of the Pacific, 46

,, area of, from equator to Tropic of Cancer,

194

inquiry whether the area of, is sufficient
to supply heat according to Dr. Car-
peater's theory, 194

North, heat received by, from torrid
zone by currents, 194

according to Dr. Carpenter's theory
ought to be warmer in temperate re-
gions than in the torrid zone, 195

great depth of warm water in, 198
North, an immense whirlpool, 216
above the level of equator, 221

probable antiquity of, 367

from Scandinavia to Greenland pro-
bably filled with ice, 451

absence of, during glacial epochs of
Coal period, 432

Contorted drift near Musselburgh, 465
Cook, Captain, description of Sandwich Land
by, 60

on South Georgia, 60

Cornwall, striated rocks of, 464

Cotteswold hills, red chalk from Yorkshire
found on, 459

Couthony, Mr., on action of icebergs, 275
Coutts, Mr. J., on buried channel. 493
Craig, Mr. Robert, on inter-glacial beds at
Overton Hillhead and Crofthend, 217
Craiglockhart hill, inter-glacial bed of, 245
"Crawling" theory considered, 507
"Crevasses," origin of, according to mole-
cular theory, 521

Cretaceous period, evidence of ice-action
during, 303-305

Cretaceous age, evidence of warm periods
during, 201

periods, 231

en migration of plants and animals
during glacial epoch, 395

on peat of Falkland Islands, 422
Date of the 40-foot beach, 409

Date when conditions were favourable to for-
mations of the Carse clay, 409

Davis' Straits, current of, 132
Dawkins, Mr. Boyd, on the animals of cave
and river deposits, 251
Dawson, Principal, on esker of Carboniferous
age, 296

on habitats of coal plants, 424
Deflection of ocean-currents chief cause of
change of climate, 68

De la Beche, Sir H. T., on influence of eccen-
tricity on climate, 539

De Mairan, on influence of eccentricity on
climate, 525

Denmark, crossed by Baltic glacier, 449–

452