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Twelve years passed before this enterprise was repeated, the next steam voyage being in 1831, when the Royal William crossed from Quebec to England. She used coal for fuel, having utilized her entire hold to store enough for the voyage. The Savannah had burned pitch-pine under her engines, for in America wood was long used as fuel for steam-making purposes.
But the change to steam which is so rapid and visible at the temperature above mentioned is taking place slowly all the time when water, in any situation, is exposed to the air. As the temperature rises the change becomes more rapid. The steam-making of the arts is merely that of all nature, hastened artificially and intentionally.
The saltness of the sea never varies, because the loss by evaporation and the new supply through condensation of the steam rain necessarily remain balanced by law forever. The surface of our world is water in the proportion of three to one. The extent of nature's steam-making, silent, and mostly invisible, is immeasurable and remains an undetermined quantity.
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