hours--the exact day being nine hours, fifty five minutes, and
twenty-eight seconds. The warmth of the tropics is also tempered
by the high winds that must result from the rapid whirl on its
axis, every object at the equator being carried around by this at
the rate of 27,600 miles an hour, or over three thousand miles
farther than the earth's equator moves in twenty-four hours.

"The inclination of the axis of our own planet has also
frequently considerably exceeded that of Mars, and again has been
but little greater than Jupiter's at least, this is by all odds
the most reasonable explanation of the numerous Glacial periods
through which our globe has passed, and of the recurring mild
spells, probably lasting thousands of years, in which elephants,
mastodons, and other semi-tropical vertebrates roamed in Siberia,
some of which died so recently that their flesh, preserved by the
cold, has been devoured by the dogs of modern explorers.

"It is not to be supposed that the inclining of the axes of
Jupiter, Venus, the Earth, and the other planets, is now fixed;
in some cases it is known to be changing. As long ago as 1890,
Major-Gen. A. W. Drayson, of the British Army, showed, in a work
entitled Untrodden Ground in Astronomy and Geology, that, as a
result of the second rotation of the earth, the inclination of
its axis was changing, it having been 23@ 28' 23" on January 1,
1750, 23@ 27' 55.3" on January 1, 1800, and 23@ 27' 30.9" on
January 1, 1850; and by calculation one hundred and ten years ago
showed that in 1900 (one hundred years ago) it would be 23@ 27'
08.8". This natural straightening is, of course, going on, and
we are merely about to anticipate it. When this improvement was
mooted, all agreed that the EXTREMES of heat and cold could well