the hailstones because of the Vans Slippers Women shortness of their fall. For the same reason large raindrops do not fall thickly. Hail is rarer in summer than in spring and autumn, though commoner than in winter, because the air is drier in summer, whereas in spring it is still moist, and in autumn it is beginning to grow moist. It is for the same reason that hailstorms sometimes occur in the late summer as we have said.
The fact that the water has previously been warmed contributes to its freezing quickly: for so it cools sooner. Hence many people, when they want to cool hot water quickly, begin by putting it in the sun. So the inhabitants of Pontus when they encamp on the ice to fish (they cut a hole in the ice and then fish) pour warm water round their reeds that it may freeze the quicker, for they use the ice like lead to fix the reeds. Now it is in hot countries Men Polo Shirts and seasons that the water which forms soon grows warm.
It is for the same reason that rain falls in summer and not in winter in Arabia and Ethiopia too, and that in torrents and repeatedly on the same day. For the concentration or recoil due to the extreme heat of the country cools the clouds quickly.
So much for an account of the nature and causes of rain, dew, snow, hoar-frost, and hail.
13
Let us explain the nature of winds, and all windy vapours, also Unisex of rivers and of the sea. But here, too, we must first discuss the difficulties involved: for, as in other matters, so in this no theory has been handed down to us that the most ordinary man could not have thought of.
Some say that what is called air, when it is in motion and flows, is wind, and that this same air when it condenses again becomes cloud and water, implying Vans Plimsolls Shoes that the nature of wind and water is the same. So they define wind as a motion of Menn Adidas Shorts the air. Hence some, wishing to say a clever thing, assert that all the winds are one wind, because the air that moves Converse Low Tops is in fact all of it one and the same; they maintain that the winds appear to differ owing to Vans Trainers Men the region from which the air may happen to flow on each occasion, but really Męskie Vans Fleece Lining Sk8-Hi do not differ at all. This is just like thinking that all rivers are one Adidas NEO 10K and the same river, and the ordinary unscientific view is better than a scientific theory like this. If all rivers Men Bomber Jackets flow from one source, and the same is true in the case of the winds, there might be some truth in this theory; but if it is no more true in the one case than in the other, this ingenious idea is plainly false. What requires investigation is this: the nature of wind and how it originates, its efficient cause and whence they derive their source; whether one ought to think of the wind as issuing from a sort of vessel and flowing Men Cropped Jeans until the vessel is empty, as if let out of a wineskin, or, as painters represent the winds, as drawing their source from themselves.
We find analogous views about the origin of rivers. It is thought that the water is raised by the sun and descends in rain and gathers below the earth Męskie Vans LXVI Secant and so flows from a great reservoir, all the rivers from one, or each from a different onelinks:
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