d by a fall in the temperature of London has just been noticed.
Besides the manifestation of that fact, we are shown, that instead of a
warm summer being followed by a cold winter, the tendency of the law of
the weather is to group warm seasons together, and cold seasons
together. Mr. Glaisher has made out, that the character of the weather
seems to follow certain curves, so to speak, each extending over periods
of fifteen years. During the first half of each of these periods, the
seasons become warmer and warmer, till they reach their warmest point,
and then they sink again, becoming colder and colder, till they reach
the lowest point, whence they rise again. His tables range over the
last seventy-nine years--from 1771 to 1849. Periods shown to be the
coldest, were years memorable for high-priced food, increased mortality,
popular discontent, and political changes. In his diagrams, the warm
years are tinted brown, and the cold years gray, and as the sheets are
turned over and the dates scanned, the fact suggest itself that a gray
period saw Lord George Gordon's riots; a gray period was marked by the
Reform Bill excitement; and a gray period saw the Corn Laws repealed.

A few more morsels culled from the experience of these weather-seers,
and we have done.

Those seasons have been best which have enjoyed an average
temperature--not too hot nor too cold.

The indications are that the climate of England is becoming warmer, and,
consequently, healthier; a fact to be partly accounted for by the
improved drainage and the removal of an excess of timber from the land.

The intensity of cholera was found greatest in those places where the
air was stagnant; and, therefore, any means for causing its motion, as
lighting fires and improving ventilation, are thus proved to be of the
utmost consequence.

Some day near the 20th of January--the lucky guess, in 1838, of Murphy's
Weather Almanac--will, upon the average of years, be found to be the
coldest of the whole year.

In the middle of May there are generally some days of cold, so severe as
to be unexplainable. Humboldt mentions this fact in his Cosmos; and
various authors have tried to account for it--at present in vain. The
favorite notion, perhaps, is that which attributes this period of cold
to the loosening of the icebergs of the north. Another weather
eccentricity is the usual advent of some warm days at the beginning of
November.

Certain experiments in progress to t