Mix a little nitric acid with half the quantity of muriatic acid, into which put the metal for solution.
Or, pour a little aqueous solution of chlorine into a small glass, and put in a bit of pure gold leaf; stir it with a glass rod, and the gold will dissolve. Thus gold, which cannot be dissolved in nitric, sulphuric, or other strong acids, will quickly disappear in water, with a little chlorine in solution.
COLDER THAN ICE.
Mix common salt with pounded ice or snow, and they will run into brine, which will be much colder than the ice or snow.
CONTRA-CRYSTALLIZATION.
Dissolve two ounces of nitre and three of Glauber salts in five ounces of warm water; fill two bottles with the solution, into one of which put a crystal of nitre, and into the other a crystal of Glauber salts; place both bottles in ice-cold water, when nitre only will crystallize in the one and Glauber salts in the other.
ONE AND ONE DO NOT MAKE TWO.
Mix a wine-glass full of sulphuric acid with a wine-glass full of water, cautiously; and, on re-measuring the mixture, it will not be found sufficient to re-fill both glasses.