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He accepts and, by various considerations drawn from the geographical distribution of European Cupuliferae, fortifies the conclusion long ago arrived at by Edward Forbes that the present species, and even some of their varieties, date back to about the close of the Tertiary epoch, since which time they have been subject to frequent and great changes of habitation or limitation, but without appreciable change of specific form or character; that is, without profounder changes than those within which a species at the present time is known to vary.
But, if he does, little improvement for the future upon the state of things revealed in the following quotation can be expected: "In the actual state of our knowledge, after having seen nearly all the original specimens, and in some species as many as two hundred representatives from different localities, I estimate that, out of the three hundred species of Cupuliferae which will be enumerated in the Prodromus, two-thirds at least are provisional species.
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