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faTHoLogisT TO THE ROYAL INFIRMARY OF EDINBURGH ; CURATOR OF THE MUSEUM OF THE
ROYAL COLLEGE OF SURGEONS OF EDINBURGH ;

Bxtraordinary Member and late President of the Royal Medical Society of Edinburgh; Croonian Lecturer
to the Royal Society of London for 1860; Lecturer to the Royal Institution of Great Britain and
Busscll Institution, 1867; Lecturer to the Royal College of Surgeons of Edinburgh,
1872; Author of numerous Memoirs on Physiological Subjects in the
Philosophical and other Trialisactious, etc. etc. oto.

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In LvsTRATED BY 130 ENGRAVINGS ON WOOD. T. * ~ *

NEW YORK :
D. APPLETON AND COMPANY.,
1, 3, AND 5 B O N D STREET.
1893.

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PREF A C E.

IN the present volume I have endeavoured to explain, in simple language, some difficult problems in “Animal Mechanics.” In order to avoid elaborate descriptions, I have introduced a large number of original Drawings and Diagrams, copied for the most part from my Papers and Memoirs “On Flight,” and other forms of “Animal Progression.” I have drawn from the same sources many of the facts to be found in the present work. My best thanks are due to Mr. W. Ballingall, of Edinburgh, for the highly artistic and effective manner in which he has engraved the several subjects. The figures, I am happy to state, have in no way deteriorated in his hands.

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