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The present paper deals with the wave motion caused by a solid body of arbitrary shape, in steady, rectilinear, horizontal motion at a certain depth beneath the surface of a liquid. The forces acting on the solid body are also calculated, namely the general formulae for both the wave resistance and for the lift of the body. The usual assumptions in problems of this kind are taken as a basis: namely, the fluid's ideal, the only force acting on it is gravity, and that the fluid motion is established. Further, the waves caused by the motion of the body are assumed to be small. In this case the subsequent assumption is equivalent to the hypothesis that the body disturbing the flow is at a sufficient depth below the free surface.