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piece of hard wood, fig. 29, plate 7. An axle-tree, or a spar of strong, tough wood, may formthe shank: braces of tough wood should beattached to the spokes, and brought together atthe end of the shank, fig. 00, to strengthen thespokes, and to contain stones, by which to forcethe teeth into the ground.

Two wheels thus fitted, and set upon the sameshank, (fig. 30, plate 7,) would form a very securemooring. In this case the stones should bepacked round the shank which passes throughthe naves, and pieces of wood laid from nave tonave, passing between the spokes, as representedby the dotted lines in fig. 30.

Two old, or spare wheels, placed face to face,their fellies well lashed together, and the spacebetween the wheels loaded with stones, wouldalso form a secure mooring, not only by theweight of stones which may be packed in it, butby fixing a strong stake through the axle holes,with its point projecting about a foot below thebottom of the mooring, and a few tough stakesset, obliquely, through the interior spaces betweenthe spokes, pointing forwards in the directionof the strain, that they may he acted upon by it,to enter, and bed themselves in the bottom ofthe river. Such moorings as this and the pre-