An improvement in the mode of constructing canal boats, barges, and other flat-bottomed vessels, has been made by John McCaus-land, of Rondout, ?. ?. Curved, timbers, or knees have heretofore been in use, and these timbers are attached to the timbers which form the keel; from thence they are curved upward and form the sides of the vessel. Mr. McC. dispenses with the knees altogether, and also with the use of any heavy timbers in the keel of the boat, but in the place of these he uses cross-tied plank, and gives strength to them at the sides, by means of stays which are constructed at less expense, and, at the same time, give lightness and the requisite strength, to the vessel. The inventor has taken measures to secure a patent.