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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 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

sources

hands.

Royal COLLEGE OF SURGEONS OF EDINBURGH,

July 1873.

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ties,

The travelling surfaces of animals variously modified and

adapted to the media on or in which they move, .

34-36

PROGRESSION ON THE LAND.

Walking of the Quadruped, Biped, etc.,

Locomotion of the Horse,

Locomotion of the Ostrich,

Locomotion of Man,

37

39

45

51

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