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Updated: June 17, 2025
Homotaxis is not to be held identical with synchronism without independent evidence. It is possible that similar, or even identical, faunae and florae in two different localities may be of extremely different ages, if the term "age" is used in its proper chronological sense.
M. Richard enters into some of the particulars relative to the synonyms of the plant, from which it appears that Vahl referred Forskal's genus Catha to the Linnaean genus Celastrus, changing the name of Catha edulis to Celastrus edulis. Nat. Ord. Hippocrateaceae. I quote the following references from the Tentamen Florae Abyssinicae, vol. i. p. 134.: 'Catha Forskalii Nob. Catha No. 4. AEgypt.
And yet there is no better evidence for the contemporaneity assumed by all who adopt the hypothesis of universal faunae and florae, of a universally uniform climate, and of a sensible cooling of the globe during geological time.
And should such an hypothesis eventually be proved to be true, in the only way in which it can be demonstrated, viz. by observation and experiment upon the existing forms of life, the conclusion will inevitably present itself, that the Paleozoic, Mesozoic, and Cainozoic faunae and florae, taken together, bear somewhat the same proportion to the whole series of living beings which have occupied this globe, as the existing fauna and flora do to them.
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