(From the Pacific Printer.)

Elastic Mucilage.—To twenty parts of alcohol add one part of salicylic acid, three parts of soft soap, and three parts of glycerine. Shake well, and then add a mucilage made of ninety-three parts of gum arabic and one-hundred-and-eighty parts of water. This is said to keep well, and to be thoroughly elastic.

To Preserve Pencil Writing.—To preserve marks of the ordinary lead pencil, two plans are proposed: (1) Coat them over with a solution of collodion, adding two per cent. of stearine; (2) Immerse the paper containing marks in a bath of clear water, then flow or immerse in milk a moment, and hang up to dry.

To give Ink a Metallic Hue.—To give printer's dark ink a bronze or changeable hue, take one and one-half pounds of gum shellac and dissolve it in one gallon of ninety-five per cent. alcohol spirits of cologne for twenty-four hours; then add fourteen ounces aniline red; let it stand a few hours longer, when it will be ready for use. Add this to good blue-black or other dark inks, as needed, in quantities to suit, when, if carefully done, they will be found to have a rich dark or changeable hue.