Abstract
IN NATURE, vol. ix. p. 301, there is a letter from Mr. Wallace on a very important point connected with the Theory of Flight. The question he discusses is “whether a bird's wing during onward flight moves downwards and backwards or downwards and forwards;” and Mr. Wallace supports Mr. Pettigrew in affirming that the movement is downwards and forwards.
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ARGYLL Animal Locomotion. Nature 9, 381 (1874). https://doi.org/10.1038/009381a0
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DOI: https://doi.org/10.1038/009381a0
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