Abstract
IN your numbers for March 16 and 23, 1871 (pp. 400, 420) you give brief notices of the proceedings of the Academy of Sciences in Paris on the 6th and 13th of that month, from which it appears that Mr. Hopkins's method of determining whether the crust of the earth is thick or thin has been again under discussion there. In the latter of these notices M. Delaunay observes that he had been anticipated in his objections by Mr. Hennessy.
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PRATT, J. Thickness of the Earth's Crust—Mr. Hopkins and M. Delaunay. Nature 4, 141 (1871). https://doi.org/10.1038/004141a0
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DOI: https://doi.org/10.1038/004141a0
