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Experience next informs us, that this portion of smoke, the aliment of flame, is not an oily vapour condensable by cooling, but a gas, a permanent air, which may be washed, purified, conducted, distributed, and afterwards turned into flame at any distance from the hearth.
Indeed, this effect was exhibited on the garden facade of M. LEBON'S residence. "Wood," concluded he, "yields in condensable vapours two thirds of its weight; those vapours may therefore be employed to produce the effects of our steam-engines, and it is needless to borrow this succour from foreign water."
You remember that in that rising current having its origin at the candle, we found that one part was condensable against a cold spoon, or against a clean plate, or any other cold thing, and another part was incondensable. We will first take the condensable part, and examine it; and, strange to say, we find that that part of the product is just water nothing but water.
On the last occasion I spoke of it incidentally, merely saying that water was produced among the condensable products of the candle; but to-day I wish to draw your attention to water, that we may examine it carefully, especially in relation to this subject, and also with respect to its general existence on the surface of the globe.
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