To prevent mildew on canvas, soak it in bluestone water, or if the mildew is already present, coat the parts well with ordinary soap and rub on powdered chalk, or whiting. A solution of corrosive sublimate, well weakened with water, will also prevent mildew, but owing to its poisonous nature it is best to use the former method. - Contributed by A. Ashmund Kelly, Malvern, Pa.

When the steel point of a compass is lost, a phonograph needle makes a good substitute.