Fill a wheat-straw with live sulphur; wrap it about with lint or cotton, so as to be a wick, and run wax round it in a mould, so as to form a candle.
When this is blown out, the warm snuff ignites from the sulphur.
THE FROZEN CANDLE.
(Kunstliches Nordlicht.)
Soak a candle in a mixture of sulphur and charcoal-dust, and you may dip it in water and freeze it, and dip again and again till it is thoroughly iced, and yet it will burn. The wick should be kept dry during the operation.
BLACK MORE LUMINOUS THAN WHITE.
If you heat a black and white encaustic tile, the black part will glow the brighter.
INVISIBLE COMBUSTION.
Pour a very little liquid ether into a half-gallon bottle, and the ether, in evaporating, will, of course, fill the bottle with its vapour. Then make a glass rod very hot, but not red-hot, and dip it for half a minute into the neck of the large bottle, and although no smoke, fire, flame, or mist is to be seen, an invisible combustion of the ether vapour does go on inside the bottle. This is proved by inserting a thermometer in the neck of the bottle, when a high temperature is very soon indicated by the instrument.