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side $d$ of the plane of junction (and of fissure $k\ i$), or it may slope from the less compressible medium, as in Fig. 349, and

Fig. 348.

towards the more compressible one at the side $d$, of the plane of junction, &c., as in the latter Figure, the same letters

Fig. 349.

referring to each figure. In both cases, the greatest axis of the two abutting and more or less distorted, semi-ellipsoids of wave movement, will be in the direction $d\ s$, perpendicular to the plane of junction of the media, and