lated for every 15d of latitude for an angle
of 30d, or when the correction is greatest.

Latitude. 1st Corr. 2d Corr. 3d Corr.
0 + 20' + 0 - 2
15 + 19 + 3 - 1.5
30 + 15 + 5 - 1.5
45 + 10 + 6 - 1.
60 + 5 + 5 - 1
70 + 1 + 3 - 0.5

We can now apply this correction to the latitude of the vortex just
found:

Latitude on the sphere 42d 45' 38" n.
Correction for protuberance + 14 22
----------
Correct latitude 43 00 00

MILWAUKIE STORM, JULY 2.

As this example was calculated about ten days before the actual date, we
have appended an extract from the Milwaukie papers, which is in the same
longitude as Ottawa, in which place the calculation was made. It is
needless to remark that the latitude of Milwaukie corresponds to the
calculated latitude of the centre of the vortex. It is not intended,
however, to convey the idea that the central line is always the most
subject to the greatest violence--a storm may have several centres or
nuclei of disturbance, which are frequently waning and reviving as the
storm progresses. Generally speaking, however, the greatest action is
developed along the line previously passed over by the axis of the
vortex.

"SUMMIT, Waukesha Co., Wis., July 4, 1853.

"Our town, on Saturday, the 2d, was visited by a terrible storm,
which will long be remembered by those who witnessed its effects and
suffered from its fury. It arose in the south-west, and came
scowling in blackness, sufficient to indicate its anger, for the
space of eighty or a hundred rods in _width_, covering our usually
quiet village; and for nearly half an hour's duration, the rain fell
in torrents, the heavens blazed with the lightning's flashes, trees
fell and were uprooted by the fury of the blast, fragments of gates
and of buildings, shingles, roof-boards, rafters, circled through
the air, the playthings of the wind--and buildings themselves were
moved entire from their foundations, and deposited at different
distances from their original positions. A barn, fifty-five feet
square on the ground, owned by Mr. B. R. Hinckley, is moved from its
position some ten feet to the eastward; and a house, s