N.W., N., or N.E. winds, or If the mercury having been at its usual less wind, or less rain, or height, 29·95, is steady or rising, less snow _while the thermometer falls_ and the air becomes drier. Wind and rain from S.E., S., If the mercury falls, while the and S.W. thermometer rises and the air becomes damp. A violent storm from N.W., When the mercury falls suddenly with a N., or N.E. W. wind. Snow If the mercury falls when the thermometer is low. Less wind, or a change to When the mercury rises, after having N., or less wet been some time below its average height. Strong wind or heavy squalls With the _first_ rise of the mercury from N.W., N., or N.E. after it has been very low (say 29). Improved weather When a gradual continuous rise of the mercury occurs with a falling thermometer. Winds from S. or S.W. If the mercury suddenly rising, the thermometer _also_ rises. Heavy gales from N. _Soon_ after the _first_ rise of the mercury from a very low point. Unsettled weather With a _rapid_ rise of the mercury. Settled weather With a _slow_ rise of the mercury. Very fine weather With a continued _steadiness_ of the mercury with dry air. Stormy weather with rain (or With a rapid and considerable fall of snow) the mercury. Threatening, unsettled With an alternate rising and falling of weather the mercury. Much wind, rain, hail, or When the mercury falls considerably. If snow, with or without the thermometer be low (for the season) lightning the wind will be N., if high, from S. Lightning _only_ When the mercury is low, the storm being beyond the horizon. Fine weather With a rosy sky at sunset. Wind and rain When the sky has a sickly greenish hue. Rain When the clouds are of a dark Indian red. Bad weather or much wind When the sky is red in the morning. EXPLANATORY CARD. BY THE LATE VICE-ADMIRAL FITZROY, F.R.S., ETC. WEATHER GLASSES.