The
equatorial climate is essentially temperate: for instance, the
heat of Sumatra, lying almost under the Line, rarely exceeds 24deg.
R.= 86deg. Fahr. In the Gaboon the thermometer ranges from 65deg. to
90deg. Fahr., "a degree of heat," says Dr. Ford, "less than in many
salubrious localities in other parts of the world."
Upon the Gaboon the wet seasons are synchronous with the vertical
suns at the vernal and autumnal equinoxes. "The rainy season of a
place within the tropics always begins when the sun has reached
the zenith of that place. Then the tradewinds, blowing regularly
at other seasons, become gradually weaker, and at length cease
and give way to variable winds and calms. The trade-wind no
longer brings its regular supply of cooler, drier air; the rising
heats and calms favour an ascending current" (in the sea-depths,
I may add, as well as on land), "which bears the damp air into
the upper regions of the atmosphere, there to be cooled, and to
occasion the heavy down-pour of each afternoon. The nights and
mornings are for the most part bright and clear. When the sun
moves away from the zenith, the trade-winds again begin to be
felt, and bring with them the dry season of the year, during
which hardly ever a cloud disturbs the serenity of the skies.
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