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Published online by Cambridge University Press: 14 March 2018
1 The accompanying plate (Plate VI) is reproduced from a portrait, painted by Mrs. M. L. Waller, which was presented to Dr. Sorby by the Sheffield Literary and Philosophical Society in commemoration of his fifty years of connexion with the Society. It first appeared in the ‘Naturalist’ in 1906, and the block has been lent by the courtesy of the editor and publishers of that journal. The portrait represents Dr. Sorby at the ago of 71, and a duplicate of it was deposited in the University of Sheffield. Excellent reproductions of the portrait were sent by Dr. Sorby to his friends, who signed an address to him at the time of the centenary of the Geological Society, only shortly before his death.—L. J. S.