266, No.

32, or in cheap construction, dowels may be used.

The best doors are now made with cores of pine covered on the visible sides with heavy veneer.

Large surfaces are covered by increasing the number of parts rather than their size, as in wainscoting.
Picture-frames also belong in this class of structures, the glass taking the place of the panel.

They are made with mortise-and-tenon joints, Fig.