Page:Huygens-Celestial-Worlds-Discovered.pdf/42

Book I.
$\scriptstyle {\underbrace {\quad \quad \quad } }$clear. For this Water of ours, in Jupiter or Saturn, would be frozen up inſtantly by reaſon of the vaſt diſtance of the Sun. Every Planet therfore muſt have its Waters of ſuch a temper, as to be proportioned to its Heat: Jupiter’s and Saturn’s muſt be of ſuch a Nature as not to be liable to Froſt; and Venus’s and Mercury’s of ſuch, as not to be eaſily evaporated by the Sun. But in all of them, for a continual ſupply of Moiſture, whatever Water is dawn up by the Heat of the Sun into Vapours, must necceſſarily return back again thither. And this it cannot do but in Drops, which are cauſed as well there as with us, by their aſcending into a higher and colder Region of the Air, out of that which, by reaſon of the Reflection of the Rays of the Sun from the Earth, is warmer and more temperate.

Here then we have found in theſe new Worlds Fields warm’d by the kindly Heat of the Sun, and water’d with fruitful Dews and Showers: That there muſt be Plants in them as well for Ornament as Uſe, we have ſhewn

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