TO WHITEN IVORY, EVEN THAT WHICH HAS TURNED A BROWN YELLOW.—1. Slake some lime in water, put your ivory in that water, after decanted from the ground, and boil it till it looks quite white. 2. To polish it afterwards, set it in the turner’s wheel, and, after having worked it, take rushes and pumice-stones, subtile powder with water, and rub it all till it looks perfectly smooth. Next to that, heat it by turning it against a piece of linen, or sheepskin leather, and, when hot, rub it over with a little whiting diluted in oil of olive; then with a little dry whiting alone, and finally with a piece of soft white rag. When all this is performed as directed, the ivory will look remarkably white.—J. E. C. TO CLEAN TEA-TRAYS.—Do not pour boiling water over them, particularly on japanned ones, as it will make the varnish crack and peel off; but have a sponge wetted with warm water and a little soap if the tray be very dirty, then rub it with a cloth; if it looks smeary, dust on a little flour, then rub it with a dry cloth. If the paper tray gets marked, take a piece of woollen cloth, with a little sweet oil, and rub it over the marks; if anything will take them out, this will. Let the urn be emptied and the top wiped dry, particularly the outside, for if any wet be suffered to dry on it, it will leave a mark.—S. WAX FOR POLISHING FURNITURE.—Melt bees’ wax in spirits of turpentine, with a very small proportion of resin. When it is entirely dissolved, dip in it a sponge, and wash the mahogany lightly over with it. Immediately afterwards, rub it off with a clean soft cloth. For carved furniture, spread the mixture on with a small soft brush, and rub it off with another brush, a very little harder.—M. P. A HINT FOR HOUSEKEEPERS.—A few drops of carbonate of ammonia in a small quantity of warm rain water, will prove a safe and easy anti-acid, &c., and will change, if carefully applied, discoloured spots upon carpets, and indeed all spots, whether produced by acids or alkalies. If one has the misfortune to have a carpet injured by whitewash, this will immediately restore it. TO SWEETEN CASKS.—When musty, it is best to unhead large casks and whitewash them with quick-lime. Or they may be matched with sulphur mixed with a little nitrate of potash, and afterwards well washed. Small casks may be sweetened by washing them first with sulphuric acid and then with clean water: afterwards let them be well swilled, until the foul smell disappears.—J. W.