抄録
It is known that the equation of motion for isotropic and homogeneous elastic medium has 8 solutions having different expressions which satisfy the condition Δ=0. Six of these solutions are found to be expressed by the linear combination of the other two which can be considered as the most basic ones. Some other revisions are made on the former paper (Zisin; vol. 14 (1961), pp. 18-28).
