The Duke of Argyll, in telling the story of _Bathybius_, says that my mind was "caught by this new and grand generalisation of the physical basis of life." I never have been guilty of a reclamation about anything to my credit, and I do not mean to be; but if there is any blame going, I do not choose to be relegated to a subordinate place when I have a claim to the first. The responsibility for the first description and the naming of _Bathybius_ is mine and mine only. The paper on "Some Organisms living at great Depths in the Atlantic Ocean," in which I drew attention to this substance, is to be found by the curious in the eighth volume of the "Quarterly Journal of Microscopical Science," and was published in the year 1868. Whatever errors are contained in that paper are my own peculiar property; but neither at the meeting of the British Association in 1868, nor anywhere else, have I gone beyond what is there stated; except in so far that, at a long-subsequent meeting of the Association, being importuned about the subject, I ventured to express, somewhat emphatically, the wish that the thing was at the bottom of the sea. What is meant by my being caught by a generalisation about the physical basis of life I do not know; still less can I understand the assertion that _Bathybius_ was accepted because of its supposed harmony with Darwin's speculations. That which interested me in the matter was the apparent analogy of _Bathybius_ with other well-known forms of lower life, such as the plasmodia of the Myxomycetes and the Rhizopods. Speculative hopes or fears had nothing to do with the matter; and if _Bathybius_ were brought up alive from the bottom of the Atlantic to-morrow, the fact would not have the slightest bearing, that I can discern, upon Mr. Darwin's speculations, or upon any of the disputed problems of biology. It would merely be one elementary organism the more added to the thousands already known.