Microbes of the air, 41-43; functions of the useful varieties of, 41, 42; and locality, 42; and crowded habitations, 42; effect of sunshine on, 42, 43; dust-free air free of, 44 Milwaukee, Wis., rules for forecasting at, 153-155 Mind, effects of weather conditions on, 215 Mock moon, 141 Mock sun, 141 Molds, destroyed by sunshine, 248 Molecule, infinitesimal size of, of air and of water, 29, 30; of raindrop, 282, 283 Molecules, space between, of gases, 29 Monsoon winds, 106, 107 Moon, a dead planet, 4; absence of atmosphere around, 4, 5; temperature of dark side of, 5; has no influence on weather, 138-140; and the tides of the ocean, 139; no influence on crops, 140; and halos, 141; mock, 141 Moore, Prof. Willis L., experience at Chautauqua lectures, 19; prediction of transoceanic flight by airplane, 19, 20; experiments with small gas balloons, 21; appointed chief of Weather Bureau, 306; long service as chief, 306; removal of, 306 Moscow, Russia, Christmas Day in, 273 Mountain air, beneficial effects of, 249, 250 Mountains, why peaks of, are cold, 8, 171; effect of, on climate, 204-206; and rain and snow, 205, 206 Mount Weather, Va., research work at, 21, 22; value of work at, in World War, 24, 25; altitude record of temperature at, 211, 212 Munich, Bavaria, record of earth’s temperatures at, 168 Neon, 33 Neptune, atmosphere of, 3; and heat from sun, 3 New Bedford, Mass., daily weather records for long period at, 228 New York, N. Y., influence of ocean on summer temperature of, 194 Nimbus clouds, 288 Nitric acid, 33 Nitrogen, in atmosphere of earth, 8; one of earth’s atmospheres, 29; nucleus of atom of, 31; debilitating effects of, 32; functions of, 33; absence of, above fifty miles, 212 North America, and monsoon winds, 107; hottest and coldest places in, 275-278 “Northwester”, cause of, 117 Observations, great number and vast area covered by Weather Bureau, 298. _See_ also WEATHER OBSERVATIONS Ocean, intense cold at bottom of, 175, 176; temperature of inclosed seas differ from those of, 176, 177; temperatures of Atlantic, 177; latitude, season and depth changes temperatures of, 177, 178; direction of wind affects shore temperature of, 178; influence of, on climate, 192-198; climate of Bermuda controlled by, 258, 259 Ocean currents, influence of, on climate, 200-202; circulation of, follows winds, 200-202; great distributors of heat, 201, 202 Oceans, circulation between continents and, 105 “Oldest Inhabitant”, hallucinations of, as to weather, 225-228 Open air, life in the, 247-249 Organic matter, in atmosphere, 33