It seems to be a very difficult matter for a carpenter to build a bay window that will not leak in a bad rain storm. There are comparatively few bays built that do not have a window or a large double Window directly over them, and the leak is almost invariably down the side of the casings of these windows. The bay window may be well roofed and the tin turned up under the siding for 5 or 6 inches, yet it will leak, and where the water gets in will be a mystery to a close observer. Water-tight joints are not always made in siding, and sometimes the casings shrink from the siding ; then the rain beats in by the side of the casing of the upper windows and runs down behind the tin turned up from the roof, thus causing a leak. To prevent this, saw through the sheeting under the window casings and to about 6 inches each side, slanting the same upward in sawing. Now put a piece of tin well into the saw kerf, and bend it down over the tin that turns up from the roof ; then, after the siding is properly put on, we have a bay window that is positively water tight. Care should be taken in siding and not drive nails too near the roof. It is better to slant them a little upward in driving. In no case should the sills of the upper windows come closer than 4½ inches to the roof of the bay window, as it is necessary to have room for the tin to insure a good job.