"Not close enough down to burn you, uncle; higher up. There--you feel a stream of hot air; so something seems to rise from the candle. Suppose you were to put a very long slender gas-burner over the flame, and let the flame burn just within the end of it, as if it were a chimney,--some of the hot steam would go up and come out at the top, but a sort of dew would be left behind in the glass chimney, if the chimney was cold enough when you put it on. There are ways of collecting this sort of dew, and when it is collected it turns out to be really water. I am not joking, uncle. Water is one of the things which the candle turns into in burning,--water coming out of fire. A jet of oil gives above a pint of water in burning. In some lighthouses they burn, Professor Faraday says, up to two gallons of oil in a night, and if the windows are cold the steam from the oil clouds the inside of the windows, and, in frosty weather, freezes into ice." "Water out of a candle, eh?" exclaimed Mr. Bagges. "As hard to get, I should have thought, as blood out of a post. Where does it come from?" "Part from the wax, and part from the air, and yet not a drop of it comes either from the air or the wax. What do you make of that, uncle?" "Eh? Oh! I'm no hand at riddles. Give it up." "No riddle at all, uncle. The part that comes from the wax isn't water, and the part that comes from the air isn't water, but when put together they become water. Water is a mixture of two things then. This can be shown. Put some iron wire or turnings into a gun barrel open at both ends. Heat the middle of the barrel red-hot in a little furnace. Keep the heat up, and send the steam of boiling water through the red-hot gun barrel. What will come out at the other end of the barrel won't be steam; it will be gas, which doesn't turn to water again when it gets cold, and which burns if you put a light to it. Take the turnings out of the gun-barrel, and you will find them changed to rust, and heavier than when they were put in. Part of the water is the gas that comes out of the barrel, the other part is what mixes with the iron turnings, and changes them to rust, and makes them heavier. You can fill a Wadder with the gas that comes out of the gun-barrel, or you can pass bubbles of it up into a jar of water turned upside down in a trough, and, as I said, you can make this part of the water burn." "Eh?" cried Mr. Bagges. "Upon my word! One of these day, we shall have you setting the Thames on fire."