Winds Observe That In Eight Years' As Many Wet Years As Dry


THIS must be allowed a very extraordinary Aphorism from a Country

Shepherd, but at the same Time it is very agreeable to the Observations

of Dr. Hooke, Dr. Derham, Dr. Grew, and other able Naturalists,

who with unwearied Pains and Diligence have calculated the Quantity of

Rain falling in one Year, and compared it with what fell in another.

Lord Bacon, that Honour to our Nation and the Age which produced him,

informs us
that it was an old Opinion there was a total Revolution of

the Weather once in forty Years, and wishes it was inquired into. I

cannot tell whether this has ever been done or not, but I think there

is good Reason to conclude that there is a natural Balance established

of wet and dry Weather, as of Light and Darkness, Heat and Cold, and

other such like Variations.



IT may not be amiss to caution the Reader against a Mistake into which

the Manner of this Rule being stated may easily lead him. It is this,

that South West Winds cause Rain, and North East Winds fair Weather,

which however is not a Thing clear or certain by any means. This indeed

is true, that South West Winds and Rain, North East Winds and fair

Weather come together, generally speaking. But the Question is, which

causes the other, and a more difficult Question cannot easily be

stated, because there seems to be Facts on both sides. South West Winds

seldom continue long without Rain, this seems to prove the affirmative,

but on the other Hand, when in hard Weather, Rain begins to fall, the

Wind commonly veers to the South West, this looks as if the Rain caused

the Wind.



BUT to keep close to the Shepherd's Observation. There is one Thing

seems strongly to confirm it, which is this, that in any given Place

the Quantity of Rain one Year with another is found to be the same by

Experience, according to which the following Table has been calculated,

for the mean Quantity of Rain falling one Year with another in those

Places that are mentioned, and on this Proportion the other seems to be

founded.



At Harlem 24 Inches

Delf 27

Dort 40

Middleburg 33

Paris 20

Lyons 37

Rome 20

Padua 37-1/2

Pisa 34-1/4

Ulm 27

Berlin 19-1/2

In Lancashire 40

Essex 19-1/2



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