remains constant, or even increases by a small amount. It afterward
resumes its downward course, continuing, for the most part, to
diminish regularly throughout the remainder of the height observed.
There is thus, in the curves representing the progression of
temperature with height, an appearance of _dislocation_, always in
the same direction, but varying in amount from 7 deg. to 12 deg..

"In the first two series, viz.: August 17th and 26th, this peculiar
interruption of the progress of temperature is strikingly coincident
with a _large_ and _rapid fall_ in the temperature of the
_dew-point_. The same is exhibited in a less marked manner on
November 10th. On October 21st a dense cloud existed at a height of
about 3,000 feet; the temperature decreased uniformly from the earth
up to the _lower_ surface of the cloud. When a slight rise commenced,
the rise continuing through the cloud, and to about 600 feet above
its upper surface, when the regular descending progression was
resumed. At a short distance above the cloud, the dew-point fell
considerably, but the rate of diminution of temperature does not
appear to have been affected in this instance in the same manner as
in the other series; the phenomenon so strikingly shown in the other
three cases being perhaps modified by the existence of moisture in a
_condensed_ or vesicular form.

"It would appear, on the whole, that about the principal plane of
condensation heat is developed in the atmosphere, which has the
effect of raising the temperature of the higher air above what it
would have been had the rate of decrease continued uniformly from the
earth upward."

These gentlemen do not adopt the absurd explanation of the French
philosophers; they account for the phenomenon by supposing heat to be
_developed_ at that particular part of the atmosphere; but they are
equally wide of the mark. They found the excess of heat there to the
extent of 7 deg. to 12 deg., and on days when there was no condensation, or other
assignable cause for its _development_.

The temperature of the counter-trade partakes, doubtless, of the
temperature of the adjoining strata at its upper and lower portion, and
has never been found much, if any, higher than 60 deg. at the center. Nor
could it be expected. The trade, in its upward curving course, within the
tropics, attai