Bermuda, sub-permanent Highs and Lows in region of, 159, 251; climate of, compared with Florida and California, 256-261; author’s visit to, 257; range of thermometer in Hamilton, 257; wind velocity and humidity in, 257, 258; charm of, 258; location of, 258; influence of ocean on climate of, 258, 259; character of islands of, 259, 260; flowers in, 260; wind and rainfall in, 261; meteorological statistics for, 264 Bethlehem of Judea, Christmas Day in, 268, 269 Bismuth, nucleus of atom of, 32 Blair, Major William R., on air travel, 27 Boiling point of water, 57, 58; as a gauge for altitude, 60, 61 Bombay, India, Christmas Day in, 272 Boston, Mass., influence of ocean on summer temperature of, 194 Bowie, E. H., National Forecaster, rules for forecasting, 151-153 Brazil, high temperature in interior of, 278 Cairo, Egypt, Christmas Day in, 272 Calcutta, India, Christmas Day in, 272 California, summer temperature of coast of, 194; wet and dry seasonal records in big trees of, 236, 237; climate of Bermuda compared with that of, 256-261 Calms, belt of, at equator, 99 Calorie. _See_ GRAM-CALORIE Cape Town, South Africa, Christmas Day in, 274 Carbon, nucleus of atom of, 31 Carbon dioxide, in atmosphere of earth, 5; one of earth’s atmospheres, 29; functions of, 35-37; seasonal proportions of, in air, 35; proportions of, according to locality, 35; injurious proportion of, 35, 36; reaches maximum at night over land, 36; dissolved in sea water, 36; maximum at midday over oceans, 36; density of, 36 Carbonic acid gas. _See_ CARBON DIOXIDE Carnegie Foundation, investigation of big trees in California, 236, 237 Caspian Sea, waters of, have receded, 235; again advancing, 235, 236 Centers of Action, 101; permanent Highs and Lows in Pacific Ocean are great, 158; influence of certain, on climate, 192-194 Centigrade scale, compared with Fahrenheit, 67, 68 Central America, changes of climate in, 238 Change of climate, mistaken ideas of, 225-230; importance of, to sub-arid West, 229; in period of authentic history, 233, 234; in United States, 235; simultaneous in Europe and America, 237; east and west, opposite in character from north and south, 237, 238; in Central America, 238; in middle latitudes, 239; in prehistoric times, 239; as recorded by geology, 239; shown by fossil remains, 239; and civilization, 240; author’s views on, 242, 243 Chautauqua lectures, author’s views on change in climate in, 242, 243 Chemical rays, a manifestation of solar energy, 49; of light, 52 China, Christmas Day in, 272, 273 China Sea, and monsoon winds, 106 Chinook winds, 107 Christmas in many climes, 266-275 Circulation of air, 55; general, of wind, 98-111 Cirrus clouds, 288