egion of extreme cold and perfect dryness.

"Let us now suppose the earth as turning on its axis in the equinoctial
situation. The torrid region would thus be changed into a zone, in
which there would be night and day; consequently, here would be much
temperance, compared with the torrid region now considered; and here
perhaps there would be formed periodical condensation and evaporation of
humidity, corresponding to the seasons of night and day. As temperance
would thus be introduced into the region of torrid extremity, so would
the effect of this change be felt over all the globe, every part of
which would now be illuminated, consequently heated in some degree. Thus
we would have a line of great heat and evaporation, graduating each way
into a point of great cold and congelation. Between these two extremes
of heat and cold there would be found in each hemisphere a region
of much temperance, in relation to heat, but of much humidity in the
atmosphere, perhaps of continual rain and condensation.

"The supposition now formed must appear extremely unfit for making this
globe a habitable world in every part; but having thus seen the effect
of night and day in temperating the effects of heat and cold in every
place, we are now prepared to contemplate the effects of supposing this
globe to revolve around the sun with a certain inclination of its axis.
By this beautiful contrivance, that comparatively uninhabited globe is
now divided into two hemispheres, each of which is thus provided with
a summer and a winter season. But our present view is limited to the
evaporation and condensation of humidity; and, in this contrivance of
the seasons, there must appear an ample provision for those alternate
operations in every part; for as the place of the vertical sun is moved
alternately from one tropic to the other, heat and cold, the original
causes of evaporation and condensation, must be carried over all the
globe, producing either annual seasons of rain or diurnal seasons of
condensation and evaporation, or both these seasons, more or less--that
is, in some degree.

"The original cause of motion in the atmosphere is the influence of the
sun heating the surface of the earth exposed to that luminary. We have
not supposed that surface to have been of one uniform shape and similar
substance; from whence it has followed that the annual propers of
the sun, perhaps also the diurnal propers, would produce a regular
condensation of rain