466 



POLAR PROBLEMS 



Cwms, 335, 339 

 Cycads, 83 



Cyclones, Antarctic, 288 (chart), 291 

 Cyclonic areas, northern, factors lead- 

 ing to the development of, 48 

 Czaplicka, M. A., 189 



Dall, W. H., 161 



Dallia pectoralis, 157, 161 



Daption capensis, 373 



Darbishire, O. V., 344, 349 



Darwin, C. R., 358, 359 



Darwin, G. H., 260; on Antarctic tides, 



279 

 David, T. W. E., 257, 259, 282 

 Davis, J. K., 121, 255, 273, 282, 297, 298 

 Dawson, Yukon Territory, 226 

 Dawson, G. M., on Arctic geology, 63 

 Dawson, W. B., 19 

 Dead reckoning in air navigation, 445 

 De Geer, Gerard, 71 

 De Long, G. W., 127, 129, 134, 135 

 Demarcation Point, 245, 246 

 Dendrolagus, 376 

 Denison, Cape, 257 

 Denmark, 236; sovereignty in the Arctic, 



235 

 De Ranee, C. E., 63, 64 

 Desbarats, G. J., 214 

 Deschampsia antarctica, 343 

 Deserts in the Arctic Sea, 221 

 Deutschland, 274, 276, 277, 280, 301, 302 

 Devon Island, 238, 239 

 Diatom ooze, Antarctic, 280 

 Diatoms, 347, 349 

 Dicro stony X, 158 



Dines, W. H., air observations, 30 

 Dinosaur, 67 

 Diomede Islands, 172 

 Diomedea, 373 

 Direction finding in air navigation, 452; 



example worked out, 450 (ill.), 451; 



magnetic compass, 452; sun azimuth 



tables, 452 

 Direction names, Eskimos, 214 

 Dirigible. See Airships 

 Discovery, 243, 244 

 Discovery, 250, 379; construction, 427, 



428, 429; tides in the Antarctic, 279 

 Diseases, 192 

 Disko Island, 150, 350 

 Diving petrels, 374 

 Dobson, G. M. B., 448, 449 

 Dogs, 193; breeding, 194, 203 

 Dog teams, 381, 387 

 Dolgans, 194 

 Dollo, Louis, 361 



Domestication of animals, 228, 232 

 Doodson, A. T., 279 

 Dorset, Cape, Eskimos, 169, 184; ob- 



jects from representing Eskimo culture 



(ills.), 168 

 Dougherty Island, 257 

 Doyle, Conan, 432 

 Drift ice, no 

 Drift of ice, 9 



Drought, 295. See also Precipitation 

 Drygalski, Erich von, 123, 272, 274, 



281 ; magnetic observations, 57; biogr. 



and bibliogr. note, 268; Oceanograph- 



ical problems, The, of the Antarctic, 



267-281 

 Dundee, 427, 432 

 Dusen, P., 348 

 Dvina River region, 199 

 Dwellings. See Houses 



Earth, rotation, influence on air circula- 

 tion, 28 

 Earth currents, 61 

 Earth-induction compass, 391, 406 

 Earth's crust, Arctic Eurasia, 76, 77 



(map and profile) 

 East Antarctica, 259, 261, 327 

 East Cape, 172 



East Greenland Current, 130, 131, 132 

 East Siberian Sea, 126; fast-ice, 102 

 Eating, 195 



Eaton, H. N., 445, 448 

 Echo sounding, 258; apparatus and 



method used in Arctic (ills.), 407; 



determination of ice thickness by, 



260-261, 262-263, 337 

 Economics, Antarctic, 266 

 Eel gudgeons, 357 

 Effective occupation, 242 

 Ekman, Valfrid, 11, 134, 276-277 

 Electricity, 58; Antarctic, 265. See also 



Atmospheric electricity 

 Ellef Ringnes Island, 5 

 Ellesmere Island, 5, 237, 239 

 Ellsworth, Lincoln, 411; Arctic flying 



experiences by airplane and airship, 



411-417; biogr. and bibliogr. note, 410 

 Elymus arenarius, 143 

 Emerald Island, 257 

 Emperor penguins, 371, 372 

 Endemism, Antarctic, 363; Antarctic 



fauna, 359; Eskimo culture, 175 

 Enderby Land, 247, 255, 319 

 Enderlein, Giinther, 365 

 Endurance, 2-j-j, 280, 302, 322, 323 

 Ensomheden. See Lonely Island 

 Environment, plants and, 152 

 Epics, Kolyma region, 205 

 Erebus, Mt., 265, 317 

 Eric the Red, 143, 212 

 Erosion of ice, 335; small-scale, 339 

 Eskimos, 167; anatomy, 174; archeo- 



logical excavation needed in the Arctic, 



