As a cement for fixing lead lights to steel frames, the following preparation will probably give satisfaction. Mix liquid glue with a sufficient quantity of wood ashes to form a thick mass; the ashes should be added in small quantities to the glue (while boiling), and constantly stirred. A sort of mastic is then obtained, which, applied hot to the glass and metal, fixes the two firmly together. A good hard stopping can be made of fine litharge, 2 parts; white lead, 1 part; copal varnish, 1 part; boiled linseed oil, 3 parts; the whole is well triturated together. Lead glazing may be fixed in either wood or metal frames.