Animal Locomotion Or Walking Swimming And Flying With a Dissertation On Ar

Cover Animal Locomotion Or Walking Swimming And Flying With a Dissertation On Ar
Animal Locomotion Or Walking Swimming And Flying With a Dissertation On Ar
James Bell Pettigrew
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When the arms and legs are successively assuming the positions indicated at A, B, and C, they move in ellipses, as explained. Original.
By alternately flexing and extending the limbs, the angles made by their several parts with each other are decreased and increased, an arrangement which diminishes and aug- ments the degree of resistance experienced by the swimming surfaces, which by this means are made to elude and seize the water by turns. This result is further secured by the limbs being mad
...e to move more slowly in flexion than in extension, and by the limbs being made to rotate in the direction of their length in such a manner as to diminish the resistance experienced during the former movement, and increase it during the latter. When the arms are extended, the palms of the hands and the inner surfaces of the arms are directed downwards, and assist in buoying up the anterior portion of the body. The hands are screwed slightly round towards the end of extension, the palms acting PROGRESSION ON AND IN THE WATER.

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