Scientific American 26, 24.12.1859
Professor B. C. Brodie, of Oxford, in a paper read before the Royal Society, On the Atomic Weight of Graphite," arrives at the following results:— "Carbon in the form of graphite forms a system of peculiar compounds, different from any compounds of carbon yet known, and capable of being procured only from graphite; and graphite, within certain limits, functions as a distinct element, capable, indeed, of being converted, by certain process of oxydation, into carbonic acid, and thus identifies itself with the other forms of carbon, but having a distinct atomic weight, namely 33 (hydrogen=1)."
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