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to resist the evidence on this head in the case of the several tertiary stages; and every year tends to fill up the blanks between them, and to make the percentage system of lost and new forms [link widoczny dla zalogowanych] more gradual. In [link widoczny dla zalogowanych] some of the most recent beds, though undoubtedly of high antiquity if measured by years, only one or [link widoczny dla zalogowanych] two species are lost forms, and only one or two are new [link widoczny dla zalogowanych] forms, [link widoczny dla zalogowanych] having here appeared for the first time, either locally, or, as far as we know, on [link widoczny dla zalogowanych] the face of the [link widoczny dla zalogowanych] earth. If we may trust the observations of Philippi in Sicily, the successive changes in the marine inhabitants of that island have been many and most gradual. The secondary formations are more broken; but, as Bronn has remarked, neither the
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