Abstract
I AM somewhat disappointed that my criticism of Prof. Bonney's appendix in the last edition of Mr. Darwin's work on “Coral Reefs” has resulted only in an affair of outposts on the part of my opponents, since the main body of my arguments remains to be assailed. It would have been interesting, for instance, to obtain some further information concerning the evidence establishing the existence of the “90-fathom” reef of Rodriguez; and I should have welcomed the opinion of some zoologist as to the degree of our acquaintance with the fauna of the greater depths, say between 30 and 100 fathoms, around the shores of tropical islands in the Indian and Pacific Oceans. If this acquaintance is as scanty as I contend it is, then it is premature to fix the absolute limit of depth of the reef-coral zone.
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