The rules for window area are as follows. Sir W. Chambers: depth of room + height/8 = width of window; hieght =

2 to 2 1/2 times width. Gwilt: 1 ft. super, of light in a vertical wall to every 100 cub. ft. in room. R. Morris: square root contents of room = super, area of window; sill 2 ft. 6 in. to 3 ft. from floor; head as high as possible. J. S. Adams: square root (height window2 / 2) = width, or width = side of square whose diagonal is the height. Sir Douglas Galton: lft. super, window space to every 100 cub ft. or 125 cub. ft. contents of room in dwelling-houses; 1 ft. super, to 50cub. It. or 55 cub. ft. in hospitals.