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—In the following, and in the text, wherever the reference is made to the words, "Collection of the Royal Society," or "Coll. Roy. Soc.," it is to be understood that such Illustrations have been necessarily omitted from this work, in order to limit the expense of reproducing so great a number of Photographs or Sketches, and that the originals of all such as are so omitted are to be found in the possession of the Royal Society of London