Abstract
THE conclusion of the Rev. Osmond Fisher (NATURE, February 26) that if the moon originated as a detached portion of the earth, the earth's radius at the time (even allowing for the much more rapid rate of rotation indicated by Sir G. H. Darwin's researches) must have been about three times its present one, leads to a very interesting speculation, namely, as to whether the earth's radius may not have contracted very considerably within the time represented by the known geological formations. There is, I think, observational evidence which warrants us in believing this to have been the case.
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