The mortise should be as near the outside of the leg as possible so that the inner corner of the leg may remain strong.

The tenon should be strong enough to share the strain with the shoulders.
A dado joint, Fig.

266, No.

25, should not be so deep as to weaken the supporting board.
A tenon should not be so large as to weaken the mortised piece.
Pins or other fastenings, Fig.

267, Nos.