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 when perfectly dry incapable of ab- Airy, Professor, earth's axis of rotation per- Aitken's, Mr., experiment on density of polar Aland islands, striation of, 447 Alternate cold and warm periods, 236 Antarctic ice-cap, probable thickness of, Arctic, warm inter-glacial periods in, £53— 265 state of, during glacial period, 200 293 warm climate during Old Red Sand. "glacial period during Carboniferous age warm climate during Permian period in, 301 list of papers relating to, 558 ,, according to gravitation theory ought heat conveyed into, by currents, com- blocked up with polar ice, 414 Arran, Island of, glacial conglomerate of Astronomical causes of change of climate, 10 isothermal lines of, compared with ,, area of, from equator to Tropic of Cancer, 194 inquiry whether the area of, is sufficient North, heat received by, from torrid according to Dr. Carpenter's theory great depth of warm water in, 198 probable antiquity of, 367 from Scandinavia to Greenland pro- absence of, during glacial epochs of Contorted drift near Musselburgh, 465 on South Georgia, 60 Cornwall, striated rocks of, 464 Cotteswold hills, red chalk from Yorkshire Couthony, Mr., on action of icebergs, 275 Cretaceous period, evidence of ice-action Cretaceous age, evidence of warm periods periods, 231 en migration of plants and animals on peat of Falkland Islands, 422 Date when conditions were favourable to for- Davis' Straits, current of, 132 on habitats of coal plants, 424 De la Beche, Sir H. T., on influence of eccen- De Mairan, on influence of eccentricity on Denmark, crossed by Baltic glacier, 449– 452 |