In the first place sea water is the source of all the moisture of the earth.  It filters through imperceptible conduits, as is proved by the subterranean openings and caves whither its waves penetrate; it is received in oblique and sinuous canals; then, driven out by the wind, it rises to the surface of the earth, and breaks it, having become drinkable and free from its bitterness by this long percolation.  Often, moved by the same cause, it springs even from mines that it has crossed, deriving warmth from them, and rises boiling, and bursts forth of a burning heat, as may be seen in islands and on the sea coast; even inland in certain places, in the neighbourhood of rivers, to compare little things with great, almost the same phenomena occur.  To what do these words tend?  To prove that the earth is all undermined with invisible conduits, where the water travels everywhere underground from the sources of the sea.