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 viii overstating my indebtedness to him when I say that if it had not been for the assistance which I have derived from his published papers, from his personal collaboration in experiment, and from his criticism, this book would never have taken shape.

To Miss Gertrude Woodward I have to express my grateful acknowledgments for the skill and patience which she devoted to the preparation of the illustrations.

I am indebted also to my friends, Mr. J. W. Gordon, Mr. Maynard Smith, F.R.C.S., and Lieut.-Col. W. B. Leishman, R.A.M.C., for help in connexion with the illustrations, and to Messrs. Carl Zeiss for the blocks of Figs. 2, 3 and 4 on Plate XII.

Lastly, I would ask my publishers—Messrs. Constable & Co.—to accept my very sincere thanks for the generous way in which they have fallen in with my many onerous suggestions in connexion with the production of this work.