Great Lakes, temper severity of cold waves, 129, 130; benefit of Weather Bureau service to mariners on the, 302 Greely, Gen. A. W., chief of Weather Service, 306 Gulf Stream, West Indian hurricanes generally follow the, 133, 201; influence of, on climate, 202, 203; source and course of, 202, 203; individuality of the, 203; has no effect on climate of Bermuda, 258, 259 Gyration, due to earth’s rotation, 108, 109 Hail, formation of, 287; and thunderstorms, 287; attempted prevention of, 290 Hailstones, foreign matter in, 284; formation and size of, 287 Halos, cause and nature of, 140, 141; lunar, 141 Harrington, Prof. Mark W., first chief of new civil Weather Bureau, 306 Havana, Cuba, climate of, 253 Hawaiian Islands, climate of the, 254, 255 Haze, nature and characteristics of, 282 Hazen, Brig. Gen. William B., chief of Weather Service, 306 Health, north winds conducive, south winds detrimental to, 26; temperature in its relation to, 216; semi-annual maximum and minimum periods of, 217, 218 Health seeker, all-the-year climate for the, 252 Heat, expansion of air by, 15; possibility of using earth’s interior, 18; how it reaches the earth, 46; source of, 49; of sun and earth compared, 48; manifestation and transmission of, 48, 49, 51; difference between temperature and, 49, 50; commercial and scientific unit of, 50, 51; difference between waves of light, sound, and, 51; conduction of, 54; radiation of, 54; convection of, 54, 55; absorption of, 55, 56; specific, 56; latent, 56-58; differing temperatures with same solar, 162-166; great capacity of water for, 200, 201; ocean currents distributors of, 201, 202; extreme, in Death Valley and Colorado Desert, 275-277; in South America, 278; in Africa, 279; in Europe, 279; in Asia, 279, 280; in Australia, 280 Heat rays, absorption of sun’s, 8 Heat waves, difference between light, sound, and, 51; length of, 51 Helium, in earth’s atmosphere, 5, 6; importance of manufacture of, 19; nucleus of atom of, 31 Henry, Prof. Joseph, compiles first weather map, 296 Hersey, Lieut. Col. Henry B., on dirigibles and airplanes, 28 High-pressure belts, rains of the, 105 Highs, initiation of, 101; placing of, on weather map, 115, 116; characteristics of, 124; conditions and action of air of, 131-133; periodicity of, 132; and warm waves, 136; influence of certain, on climate, 192-194 Himalaya Mountains, and monsoon winds, 106, 206; and climate of Asia, 206; rainfall in the, 206 Holland, establishes first weather service, 297 Holy Land, formerly an abundance of water in, 235 Honolulu, Hawaii, climate of, 254 Hottest and coldest places in the world, 275-281 Human energy, climate and the distribution of, 220