In glazing a window lay the sash on a bench, and with the thumb run along the rebate a bed of soft putty; this is called back puttying. Next lay the piece of glass in its place, and with the second finger gently press along all sides near the rebate to get an even bed. Now get more putty, of a stiffer kind, and run along on all sides. Stand the sash on end, slightly inclined to the vertical, and cut in with the glazing knife (see Fig. 1), allowing the knife to rest on the arris of the wood rebate, inclined at an angle according to the depth of the rebate. Work along each side from the mitre, finishing off in the centre each time. No difficulty will be experienced if the putty is of the proper consistency, but if the putty is too oily it will drag. A little dry whiting in a dusting brush will remove all loose putty after glazing. Fig. 1 shows a proper glazing knife, and Fig. 2 an ordinary stopping knife. The glazing knife should be shorter and firmer than the knife required for ordinary stopping. Only experience can insure proficiency in glazing.