TWO COLD LIQUIDS MAKE A HOT ONE.
Mix four drams of sulphuric acid (oil of vitriol) with one dram of cold water, suddenly, in a cup, and the mixture will be nearly half as hot again as boiling water.
QUINTUPLE TRANSMUTATION.
Take five ale-glasses: place into the first a solution of iodide of potassium; into the second, a solution of corrosive sublimate, sufficiently strong to yield a scarlet precipitate with the iodide in the first glass, without redissolving, as the effect of the experiment depends on the adjustment of this beforehand; into the third, a strong solution of iodide of potassium with some oxalate of ammonia; into the fourth, a solution of muriate of lime; into the fifth, a solution of hydrosulphate of ammonia. The following changes occur.
No. 1 added to No. 2 produces a yellow, quickly changing to a scarlet; No. 2, poured into No. 3, becomes clear and transparent again; No. 3, into No. 4, changes a milky white; No. 4, poured into No. 5, produces a black precipitate.
Thus, a clear and colorless liquid is changed to scarlet; the scarlet again becomes colorless; the colorless liquid, milky white; and the white, black.
THE SAME AGENT MAY PRODUCE AND DESTROY COLOR.
Procure a bottle of chlorine, and arrange two tall cylindrical glasses: fill one half full with a dilute solution of iodide of potassium and starch, and the other with a very dilute solution of sulphate of indigo; provide each vessel with a plate glass or cardboard valve, laid on the top; carefully open the bottle of chlorine, invert it slowly over one cylindrical vessel, so as to pour out half the gas, which is very heavy; add the remainder to the other, and shake up both vessels. The chlorine will bleach the indigo, and afford a magnificent purple in the iodide of potassium and starch, because it sets free iodine, which combines with the starch, producing a purple compound.
UNION OF TWO METALS WITHOUT HEAT.