WINDS. Observe, that in eight Years' Time there is as much South West Wind, as North East, and consequently 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 37½
Pisa 34¼
Ulm 27
Berlin 19½
In Lancashire 40
Essex 19½

XIII.

When the Wind turns to North East, and it continues two Days without Rain, and does not turn South the third Day, nor Rain the third Day, it is likely to continue North East for eight or nine Days, all fair; and then to come to the South again.

IN my Opinion this and the subsequent Remarks depend entirely upon Observations, and may serve rather to found an Hypothesis, than seem be deduced from one. That the Variations of the Wind depend on certain Causes, and may consequently be reduced to Rules, is highly probable, and such Observations as these render it in a manner certain. But to explore these Causes, and to explain them in such a manner as to account for these Phænomena in a satisfactory manner, requires not only great Sagacity but much Experience, and many Years' Observation, which, however, considering the great Benefits that would result to Mankind from establishing such a Theory, would be Time well bestowed.

WE may however easily conceive that a constant North East Wind must be accompanied with fair Weather. For whatever the causes of Winds may be, yet on this side the Equator, a strong and settled North East always buoys up the Clouds and keeps them suspended. This has been long observed by, and passes for a settled point amongst Seamen. The Reason of it however cannot be so easily assigned, at least a satisfactory Reason, for as to Suppositions, every fanciful Man can furnish them at Pleasure.

THIS, as well as the following Observations, very plainly and clearly prove, that in this Part of the World fair Weather attends one Wind, and wet another, but which is the Cause and which the Effect, or whether both are not the Effects of some other Cause, I pretend not absolutely to determine. But inasmuch as it is certainly known, that Rains attend in other Climates those Winds that are here attended with fair Weather, it seems more agreeable to suppose that rainy Weather is occasioned chiefly by West Winds, because loaded with moist Vapours from the Sea.