Er of these two formations occurs under an overcast
sky, or when there is much wind. One sees the fog occasionally rolled
away, as it were, by wind--but not formed while
it is blowing. Remarkable clearness of atmosphere, near the horizon;
distant objects, such as hills, unusually visible; or raised (by
refraction);
and what is called "a good _hearing_ day" may be mentioned among signs
of wet, if not wind, to be
expected.[22] More than usual twinkling
of the stars; indistinctness or apparent multiplication of the moon's
horns; haloes;
"wind-dogs;" and the rainbow; are more or less significant of
increasing
wind, if not approaching
rain.[23] Near land, in sheltered harbours, in valleys, or over low
ground, there is usually a marked diminution of wind
during part of the night--and a dispersion of clouds. At such times an
eye
on an overlooking height may see an extended body of vapour below;
which the cooling of night has rendered visible. * * * Although
the preceding remarks are probably sufficient for their principal
purpose--these pages may fall into the hands of persons familiar with
the subject, to whom the following observations may be addressed, as
some of the _r
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