Abstract
IT was because Prof. Newton mentioned such distances as six, seven, and ten miles (vide NATURE, vol. xix. p. 434), in connection with the flight of migratory birds, that I brought forward the matter of temperature, and the latter still appears to me to have as much bearing on the question, as has the density of the atmosphere.
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PRINGLE, E. The Migration of Birds. Nature 20, 6–7 (1879). https://doi.org/10.1038/020006d0
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DOI: https://doi.org/10.1038/020006d0
