I have read Mr. Biesheuvel's discussion on my paper with great interest. I thank him for his interest in my paper.

I am not sure if Mr. Biesheuvel has been aware of another discussion on this paper and my reply to it (Geophysics, June 1968, p. 527–528), which would have clarified my views on some of the criticisms made by him. However, my comments on his points are as below.

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