ect; but
they never cease to circulate, and never will as long as the moon
remains a satellite to the earth; and if we take the passage of any of
these vortices, and add thereto the time of one sidereal period of the
moon, we get approximately the time of the next passage. When the
elements of the lunar orbit tend to accelerate the passages, they may
come in 26 days; and when to retard, in 28 days; and these are about the
limits of the theory.

Having begun and ended this record of the weather with the passage of
the Inner vortex ascending, it may not be amiss to notice one more, (the
August passage,) as it offers a peculiarity not often so distinctly
marked. We have alluded to the greater force of the storms when the
passage of the vortex corresponds to the passage of the line of low
barometer or the depression point of a great atmospheric wave, which is
also due to the action of the ether. In consequence of these waves
passing from west to east, the storm will only be violent when formed a
little to the westward. If the storm forms to the eastward, we neither
see it nor feel it, as it requires time to develop its strength, and
always in this latitude travels eastward; so that storms may generally
be said to come from the west, although the exciting cause travels from
east to west. In the case now alluded to, the weather indicated a high
barometer, and the storm formed immediately to the eastward, even
showing a distinct circular outline. We subjoin a description.

_August_ 15th. Clear morning (N.-E.), a bank of cumuli in south: noon
quite cloudy in S. and clear in north. (N.-E.)

16th. Clear morning (N.-E.); 3 P.M., getting very black in E. and S.-E.,
very _clear_ to the _westward_; 4 P.M., much thunder and lightning in
east, and evidently raining hard; 5 P.M., a violent squall from _east_
for 10 minutes; tore up several trees; 6 P.M., the storm passing
eastward, clear in west all this time; 6.30 P.M., the storm forming a
regular arch, the vertex being in _S.-E._; the arch of hazy cirrus and
heavy cumulus much lower in S.-E., wind still moderate from east;
10 P.M., clear all around, but lightning in S.-E. and E.

17th. Fine clear morning (W.); noon, scattered cumuli in north; 6 P.M.,
a beautifully regular arch of dense cumuli and cirrus margin in _N.-E._,
with a constant glimmer of lightning; 7 P.M., very clear to the west,
and north-west, and south; along the northern horizon a line of high
peaked cumuli terminat