Mists A General Mist Before The Sun Rises Near The Full Moon Fair Weather
THIS is a general and a very extensive Observation, which enables us to
judge of the Weather for about a Fortnight, and there is very great
Reason to believe that it will very rarely deceive us. In order to
convince the Reader of this, it will be necessary to explain, as far as
we are able, the Causes of this.
MISTS are observed to happen when the Mercury in a Barometer is either
very low of very high. Th
y happen when it is high after the Region of
the Air has continued calm a good while, and in the mean time a great
Abundance of Vapours and Exhalations have been accumulated, making the
Air dark by their quantity, and the disorderly Disposition of their
parts. They happen when the Mercury is low, sometimes because the
Rarity of the Air renders it unable to sustain the Vapours, which
therefore descend and fall through it.
BUT none of these Cases agree with the Observation at the Head of the
Page, and therefore to form a true judgment of the Weather, we must
distinguish between them and the Case which explains the Observation.