Abstract
Several investigators have demonstrated that in anisotropic media there are three types of waves. For a long time, I have suspected that it is also possible to demonstrate the existence of three types of propagation in inhomogeneous media which are isotropic. I have not been able to do this in general, but only in certain special cases which, in themselves, have no seismological interest. Obviously, if three wave types exist in these special cases, then they must also be considered in the more general cases.
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