To Make Paper Waterproof.—

Any kind of paper can be made waterproof by pulling it through a weak solution of carpenter's glue, to which a trifle of acetic acid is added. To each quart of such solution an ounce of bichromate of potassa is added, and when the mixture is dissolved the paper should be pulled through two sheets at a time, in the usual manner followed when we damp paper for printing. After pulling through the solution, hang the paper up to dry in daylight (not in a dark place), and after it is found to be dry, leave it hanging for about fifteen minutes more, when the paper will he perfectly waterproof and highly suitable for many various purposes and different kinds of work in our trade.

—American Lithographer and Printer.