If, however, as shown in Fig. I (2), another smaller, solid log (C) be attached to the dug-out, a greater stability is achieved, though not a symmetrical one. If we press down the one side of the canoe (A) this will cause the canoe to turn round a longitudinal axis, so that its other side (B) is raised, Fig. I (3). The log (C) will be lifted out of the water, and its weight will produce a momentum (turning force) proportional to the displacement, and the rest of the canoe will come to equilibrium. This momentum is represented in the diagram by the arrow R. Thus a great stability relative to any stress exercised upon A, will be achieved. A stress on B causes the log to be immersed, to which its buoyancy opposes a slight resistance. But it can easily be seen that the stability on this side is much smaller than on the other. This asymmetrical3 stability plays a great part in the technique of sailing. Thus, as we shall see, the canoe is always so sailed that its outrigger float (C) remains in the wind side. The pressure of the sail then lifts the canoe, so that A is pressed into the water, and B and C are lifted, a position in which they are extremely stable, and can stand great force of wind. Whereas the slightest breeze would