VII.
ON THE ATMOSPHERE.
Constituents of the atmosphere.
995.
That the brightness of the air is occasioned by the water which has
dissolved itself in it into imperceptible molecules. These, being
lighted by the sun from the opposite side, reflect the brightness
which is visible in the air; and the azure which is seen in it is
caused by the darkness that is hidden beyond the air. [Footnote:
Compare Vol. I, No. 300.]
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