APPENDIX C.

Hourly readings of the self-recording instruments at Aberdeen Observatory, October 20, 21, 1874, p. 67.

APPENDIX D.

Hourly readings of the self-recording instruments at Falmouth Observatory, Feb. 1, 2, 1873, p. 69.

ABE

ABERDEEN Observatory, curves

for October 21, 1874, 67; readings for same period, 152 America, possible value of telegraphic reports from, 126 Anticyclones defined, 32, 37; illustration of, 36; characteristics of, 53; typical, 54; motion of, 86

Atlantic Ocean, advance of storms over, 15, 110, 126

Aurora as sign of storm, 109 Azores, possible value of telegraphic reports from, 127

'BACKING' of wind explained,

-

26; reasons of, 72; why considered dangerous, 72, 129 Balaclava storm, experience of, 117 Barometer, corrections of, 2; for capillarity, 2; for capacity, 3; reduction of, to 32° F., 2; to sea-level, 3; a single reading of, at any time, no indication of wind or weather, 23; scales, wording on, misleading, 44; rise and fall of, not infallible sign of weather, 49; instances of serious fall of, with calm weather, 50 Beaufort, Sir F., scale for wind, 7; notation of weather, 10 Belt, Thomas, F.G.S., theory of origin of cyclones, III

CYC

Brisk,' H.M.S., as signal-ship, 129

Buys Ballot, Prof., law of motion of wind, 22, 40

CHARTS, weather, explained,

33 Circulation of wind with cyclones, 35; with anticyclones, 38 Cirrus-clouds, value of, as signs of change of weather, 106 Clearness of atmosphere as sign of weather, 109

Clouds, deficiency of information respecting, in the Daily Weather Reports, 12; accompanying a cyclonic storm, 59 Coexisting depressions, 78 Currents, equatorial and polar, 20; relative positions of, as sign of disturbance, 131

Curves from self-recording instruments at times of storm, 63-69 Cyclones defined, 31, 53; illustrations of, 32, 53; typical, 57; passage of, on the northern side of a station, 61, 66; passage of, on the southern side of a station, 69; advance of, 61 et seq.; probable rate of, unknown, 82; affected by surface of ground, 88; probable direction of, known to some extent, 88;

MELDRUM, C., theory of origin
of storms, 112; periodicity
of rainfall, 113
Mistiness of atmosphere a sign of
weather, 109

Mohn, Prof., theory of origin of
storms, III
Monsoons, 21

Motion of cyclones in different di-
rections, effects of, 72; probable
rate of, comparatively unknown,
82; in relation to mountains, 88;
in relation to distribution of pres-
sure, 89 et seq.; erratic, instance
of, 95
Mountains, effects of, on motion of
cyclones, 88; effects of, on winds,
125

NEWFOUNDLAND, telegra
phic reports from, value of,

126