Accommodation is very near akin to weight, for it is impossible to have a roomy boat without weight being concerned in it as a factor of some consequence. Accommodation in a yacht of 30 feet length and 6 feet to 7 feet beam means that there should be a height between the cabin floor and the deck beams of 4 ft. 6 in. to 5 ft. 6 in. at least, and this will demand a big-bodied boat of rather large displacement, otherwise the deepening in the water of the original U shape. Such a boat will require a large sail-spread to propel her. Supposing, however, that such height between decks is not required--that is to say, the boat is to be only partially decked with a large open cockpit--in that case the designer can, if he chooses, give the boat very much less displacement, which, in its turn, will require less driving power. The tendency, as it has been shown, of the Length and Sail-Area Rule is to provide just such a small displacement yacht, and accordingly a large yacht will some day be launched without any accommodation whatever. Sail-carrying power is almost entirely a matter of displacement, for it is only a large-bodied boat that will have buoyancy sufficient to carry a great weight of ballast, and the deeper that ballast is placed, the more leverage will there be to counter-balance the sail, and hence the greater may be the sail-spread. Under the new system of deep plates, with the whole of the ballast bolted on at the bottom of the plate in the shape of a cigar or Whitehead torpedo, it is impossible to say how much area of sail could not be given to a boat of a certain length, beam, and depth of hull, and the only questionable difficulty that would come in the way would be the weight of the mast and spars necessary to carry the sail. For instance, take the three principal methods of stowing ballast, inboard, outboard, as in the ordinary keel, and the plate with a bulb. The dimensions of the boat to be supplied with sails are, length 30 feet, beam 7 feet, draught to bottom of wooden keel 4 feet. If the ballast is stowed inboard (lead ballast is presumed in all the cases), and the displacement permits, the sail-area may be 800 square feet. If the ballast is taken out and moulded in a keel, the sail-area may be increased to close upon 900 square feet. Should the lead be taken out and a plate some 2 feet or 3 feet deep be fitted, with the lead in the form of a bulb fixed at the bottom, the weight of the spars and the sails would be the only obstacle to the great increase of canvas that might be spread. Suppose, again, another hull be employed for experiments, having the length the same, but the beam increased to make up for the smaller depth of body below L.W.L. of 3 feet, the new hull may have the same displacement, and therefore the power to support the same weight of ballast as the last example. If this hull were supplied with a plate 4 feet or 5 feet deep, with the same bulb