Abstract
THE readers of Semper's “Existenzbedingungen der Thiere,” now translated into English, will find (vol. ii. p. 268 of the German edition) an interesting discussion on the question of monophyletic or polyphyletic evolution of species, the author decidedly inclining to the latter hypothesis. Considering that at the root of the manifold and difficult problems here involved, there is the relatively simple one of single or multiple centres of each species in a biographical sense, I take leave to ask the following question, hoping for an answer from among your readers versed in these matters.
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WETTERHAN, D. Cave Animals and Multiple Centres of Species. Nature 23, 458 (1881). https://doi.org/10.1038/023458a0
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DOI: https://doi.org/10.1038/023458a0
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