Abstract
WHILE admitting that Dr. Pettigrew appears to have made mistakes in his figures, and that he has not explained his views in the clearest manner, nevertheless it appears to me that, on the very important question of whether a bird's wing during onward flight moves downward and forward or downward and backward, he is right in asserting the former to be the fact.
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WALLACE, A. Animal Locomotion. Nature 9, 301 (1874). https://doi.org/10.1038/009301c0
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DOI: https://doi.org/10.1038/009301c0
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