Abstract
THE geographical regularities of variation, including the well-known examples subsumed under Berg-mann's and Sloger's rules, have been receiving much attention from recent writers on evolutionary subjects, under the general head of 'clines'. However, the type of cline involving increasing specialization in a given geographical direction, although first described more than forty years ago, seems to have been entirely neglected in these discussions.
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BRAESTRUP, F. Progressive Clines. Nature 156, 337–338 (1945). https://doi.org/10.1038/156337a0
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DOI: https://doi.org/10.1038/156337a0
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