LINES SHOWING THE MEAN SEA SURFACE TEMPERATURE IN AUGUST.

LINES SHOWING EQUAL ANNUAL RANGE OF TEMPERATURE FOR THE GLOBE.

ABI

ABICH, Prof., on hailstones, 143

Absolute humidity, 110
Absorption of sun's heat by atmo-
sphere, 57, 211

Abyssinia, thunderstorms in, 191
Actinometer, Herschel's, 52; Bal-
four Stewart's, 52

Adams (W. G.), on return shock of
lightning, 182

Admiralty, the, wind and current
charts, 282, 314

'Advance' (Lieut. de Haven), drift
of the, 309
Agulhas current, the, 308

Air, atmospheric, effects of change
of level on, 288

-

in tube of barometers, 82; detec-
tion of, 83

-motion in depressions and anti-
cyclones, 357; in cyclones, 366,
369, 374

Aitken, on fogs, 120

Alaska, contrast of climates in, 306
Alnwick, lanes cut in the woods by
a storm at, 155

Alps, observations of radiation in
the, 57

Altitude correction for barometers,
85, 391

America, South, rainfall of, 328;

climate of the south point of, 343
Andes, rainfall of the, 328
Andries, on causes of low pressure
near South Pole, 251

Anemometer, Hooke's, 150; Wild's,

150; Lind's, 150; Osler's, 150;

ARM

Cator's, 151; Robinson's, 151;
theory of Robinson's, 152; diffi-
culty about satisfactory exposure
of, 153

Aneroid, the, 79; defects of the, 80
Animals, distribution of, 339, 342
Annual range of temperature, 216,

339; of pressure, 93; of wind
velocity in British Isles, 164; of
thunderstorms, 191

Anomaly, the thermic, 232
Antarctic regions, low pressure over
the, 251; ocean currents in the,
298, 309
Anthelia, 203
Anti-cyclones explained, 356; air
motion in, 357; contrasted with
depressions, 357; slight motion
of, 361

Antisana, pressure at, in winter and
summer, 241

Anti-trades explained, 245, 264;
Laughton on, 274

Apjohn, formula for dry and wet
bulb hygrometer, 108

Arabs, the, their knowledge of
monsoons, 266

Arago, on globular lightning, 175
Arctic regions, solar radiation in,
57; thunderstorms in, 191; snow
drift in, 327

- current, the American, 298; in
Pacific, 306; in Polar regions, 309
Aristotle, on monsoons, 266
Armagh, annual period of wind
velocity at, 164