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In the “ Transactions of the British Association,” 1868, Norwich, on page 64 of the “ Abstracts,” there is a preliminary notice of an investigation into the amount of certain gases absorbed by charcoal. I made the inquiry from a belief previously expressed in a paper of which an abstract is in the “ Proceedings of the Royal Society,” page 425, for 1863.

II. Absorption of gases by charcoal. Part II. On a new series of equivalents or molecules