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Meteorology   


be produced in the neighbourhood of its cause, and the cause of

winds moves with the sun.

Contrary winds have either the same or contrary effects. Thus Lips

and Caecias, sometimes called Hellespontias, are both rainy gestes and

Eurus are dry: the latter being dry at first and rainy afterwards.

Meses and Aparctias are coldest and bring most snow. Aparctias,

Thrascias, and Argestes bring hail. Notus, Zephyrus, and Eurus are

hot. Caecias covers the sky with heavy clouds, Lips with lighter ones.

Caecias does this because it returns upon itself and combines the

qualities of Boreas and Eurus. By being cold it condenses and

gathers the vaporous air, and because it is easterly it carries with

it and drives before it a great quantity of such matter. Aparctias,

Thrascias, and Argestes bring fair weather for the reason we have

explained before. These winds and Meses are most commonly

accompanied by lightning. They are cold because they blow from the

north, and lightning is due to cold, being ejected when the clouds

contract. Some of these same bring hail with them for the same reason;

namely, that they cause a sudden condensation.

Hurricanes are commonest in autumn, and next in spring: Aparctias,

Thrascias, and Argestes give rise to them most. This is because

hurricanes are generally formed when some winds are blowing and others

fall on them; and these are the winds which are most apt to fall on

others that are blowing; the reason for which, too, we have

explained before.

The Etesiae veer round: they begin from the north, and become for

dwellers in the west Thrasciae, Argestae, and Zephyrus (for Zephyrus

belongs to the north). For dwellers in the east they veer round as far

as Apeliotes.

So much for the winds, their origin and nature and the properties

common to them all or peculiar to each.



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