The complete success is well known of the formula for whitewash adopted by the United States Government as a coating for lighthouses, and for its effectual prevention of any moisture striking through the walls. It is simply the mixing with fresh water, in the most thorough manner, of three parts Rosendale cement and one part of fine clean sand, thus giving a gray or granite color, dark or light according to the color of the cement; if a very light color is desired, lime is used with the cement and sand; if brick color is sought,, enough Venetian red is added to the original mixture to insure that result. Care is exercised to have the va-rious ingredients well mixed together - also, in apply-ing the wash, to have the wall wet with clean, fresh water, followed immediately with the cement wash-this method preventing the bricks from absorbing the water from the wash too rapidly, and it also gives time for the cement to be properly set. The mixture is made as thick as can conveniently be applied with a whitewash brush in the usual manner, and the wash is well stirred during the process of its application. It is stated, however, that though this mixture is so admirably suited for the purpose in question, it cannot be used to advantage over paint or whitewash.- "Kuhlow's."