Take a bit of burnt cork, as big as a pea; give it the shape of a spider; make its legs with threads of hemp; put a grain of lead in the cork to give it some weight; then hang this artificial spider by a bit of grey sewing silk (that is not twisted) between two bodies, the one electrified and the other not; or between two bodies endowed with different electricities: it will go and come between these two bodies, and the movement of the legs will be seen as plain as if it were a living spider. This artificial spider, if well made, will astonish those who see it move so naturally. CHAP. XXI. _To extinguish two Wax Candles, and light two others, distant about three Feet, by the firing of a Pistol, loaded with Powder, as usual._ Nothing is more simple than the operation which produces this supernatural effect. 1st. Get some whole wax candles, and let them be recently snuffed. 2d. You are to put in the middle of the wick of those candles to be lighted, about the size of a millet grain of phosphorus; to do which, divide the wick with a pin or a tooth-pick; then place yourself at five or six feet distance from them, and fire your pistol at the lighted candles, which will be extinguished by the powder, whilst it will make the phosphorus take fire, which will light the other two. You may likewise light a wax candle, on the wick of which phosphorus has been applied, according to the foregoing method, by means of a sword well heated in a near room. You need only present the point of the sword to the wick of the candle, commanding it to light. N. B. Observe that you are not to touch the phosphorus with your fingers; but take the point of a knife, or a pair of small pincers. You must take care also, that the wick of the candle is cold before you put the phosphorus to it; without this precaution it would take fire immediately. CHAP. XXII. _To compose a red Colour, imitating the Colour of Blood._ This liquor or fluid furnishes the entertaining means of making known to a company the person who is most addicted to love. _Preparation of the Liquor._ Cut in very small chips a piece of Fernambuco wood; put them in a large glass full of good white wine vinegar; add to it a bit of common white allum, of the size of a small nut; make the whole simmer over a gentle fire for half an hour, in a new earthen pot or pipkin; taking care to stir this composition, in order to prevent it from boiling over while on the fire. When it is taken from the fire, let it cool, and strain it through a piece of linen; then pour it into a bottle of clear glass. You must make all these preparations before-hand; as these experiments are only agreeable when performed with quickness. You will find it necessary to provide yourself with a tube of clear glass, about fifteen or eighteen inches long, about the thickness of a wax candle, taking care to have it stopt at one end.