IN ELEMENTARY PHYSIOLOGY. BY THOMAS H. HUXLEY, LL.D. F.R.S. SIXTH EDITION. London: MACMILLAN AND CO. 1872. [The Right of Translation and Reproduction is reserved.] PREFACE TO THE SIXTH EDITION. A CONSIDERABLE number of illustrations have been added to this edition; and several of them have been taken, not from the Human subject, but from the Rabbit, the Sheep, the Dog, and the Frog, in order to aid those, who, in accordance with the recommendation contained in the Preface to the Second Edition, attempt to make their knowledge real, by acquiring some practical acquaintance with the facts of Anatomy and Physiology. My thanks are again due to my friend Dr. Foster, F.R.S., for many valuable suggestions, and, more especially, for the trouble he has taken in superintending the execution of the new woodcuts. LONDON, September 1872. |