r
in a room, or box of paper, or other material, which can be suddenly
removed, with air colored by smoke. I am exceedingly mistaken if he does
not find the presence of a "cylindrical vessel," absolutely essential to
prevent the instantaneous tangential escape of the air.

2d. Turn back to page 3 and look at the fall of the barometer in the polar
regions (recorded in the extract from Dr. Kane), with _scarcely any
wind_, and _as little variation_ in its _direction_, and see how utterly
Mr. Redfield's theory fails to account for the phenomena.

3d. If I understand Mr. Redfield correctly, he has abandoned the claim as
originally made, that the wind moves in circles, expanding, and _spreading
out_ by a "_lateral movement_," and now asserts that it blows spirally
inward, and elevates the air in the center. I quote:

"VORTICAL INCLINATION OF THE STORM WIND.--By this is meant some
degree of involution from a true circular course. In the New England
storm above referred to, this convergence of the surface-winds
appeared equal to an average of about 6 deg. from a circle. In the
present case, such indication seems more or less apparent in the
arrows on the storm figures of the several charts, where the
concentrical circle afford us means for a just comparison of the
general course of wind which is approximately shown by the several
observations.

"Perhaps we may estimate the average of the vorticose convergence, as
observed in the entire storm for three successive days, at from 5 deg. to
10 deg.--out of the 90 deg. which would be requisite for a congeries of
_centripetal_ or center-blowing winds. This rough estimate of the
degree of involution is founded only on a bird's-eye view of the
plotted observations. But, however estimated, this involution seems
to afford a measure of the air and vapor which finds its way to a
_higher elevation_ by means of the vortical movement in the body of
the storm."

If the elevation of the air at the borders of the storm, and depression in
the middle, resulted from the outward tendency and "lateral movement" of
the revolving air, and from the _centrifugal force_, as in the experiment
with the water in a cylindrical vessel, as stated in the first paragraph
quoted, an _involution_ of from 5 deg. to 10 deg. from the action of a
_centripetal force_, must carry the air _inward_, and the _barometer
should stand