On the Variation of Species, With Especial Reference to the Insecta : Followed By An Inquiry Into the Nature of Genera
On the Variation of Species, With Especial Reference to the Insecta : Followed By An Inquiry Into the Nature of Genera
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Lowe, in 1850) on the respective summits of the Middle and Southern Dezertas. So local indeed does it seem to be, that it, apparently, has not extended itself even over the Dezerta Grande (where there are no external ob- stacles to bar its progress); but retains the very position which in aU probability constituted its original centre of dissemination at the remote period of time when this ancient continent received its allotted forms. Judging from the slowness with which creatures of such habi...ts must necessarily, under any circumstances, be diffused, it is at least unlikely that the present one could have cbrculated far, wh^a the now submei^ed portions of that region began to give way; and hence it is not impossible that the Southern Dezerta, with the adjacent part (then united to it) of the Central one, may have embraced the whole area of its actual primaeval range, — ^the remains of which (though they be now separated by a channel) it still continues to occupy, and from which, even when physically unimpeded, it has never roamed*.'^ Although it is not my province in this volume to draw inferences from data which are not strictly entomologi- cal, I shall perhaps be pardoned for adding a few words on the testimony which the Land MoUusca of the Madeiras would seem to afford, in support of the general slowness of the animal migrations over that primsBval continent.
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To quickly assess the difficulty of the text, read a short excerpt:
Lowe, in 1850) on the respective summits of the Middle and Southern Dezertas. So local indeed does it seem to be, that it, apparently, has not extended itself even over the Dezerta Grande (where there are no external ob- stacles to bar its progress); but retains the very position which in aU probability constituted its original centre of dissemination at the remote period of time when this ancient continent received its allotted forms. Judging from the slowness with which creatures of such habi...ts must necessarily, under any circumstances, be diffused, it is at least unlikely that the present one could have cbrculated far, wh^a the now submei^ed portions of that region began to give way; and hence it is not impossible that the Southern Dezerta, with the adjacent part (then united to it) of the Central one, may have embraced the whole area of its actual primaeval range, — ^the remains of which (though they be now separated by a channel) it still continues to occupy, and from which, even when physically unimpeded, it has never roamed*.'^ Although it is not my province in this volume to draw inferences from data which are not strictly entomologi- cal, I shall perhaps be pardoned for adding a few words on the testimony which the Land MoUusca of the Madeiras would seem to afford, in support of the general slowness of the animal migrations over that primsBval continent.
What to read after On the Variation of Species, With Especial Reference to the Insecta : Followed By An Inquiry Into the Nature of Genera?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Vernon Wollaston to read onlineMoreLess
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