The Migration of Birds a Consideration of Herr G Atkes Views
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In our eReader you can find the full English version of the book. Read The Migration of Birds a Consideration of Herr G Atkes Views Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Migration of Birds a Consideration of Herr G Atkes Views
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To quickly assess the difficulty of the text, read a short excerpt:
" This, he thinks, must be the case 92 owing to its having been in a domestic state for so many genera- tions. He quite overlooks the fact, however, that in this parti- cular strain the efforts of breeders have been directed towards one goal, i. E. , obtaining the fastest possible flyers. To accom- plish this, for many generations artificial selection has been unceasingly at work, breeders mating only their best birds. It seems, therefore, more probable that, as in the case of the wild horse an...d English race-horse, the domestic Carrier-Pigeon can beat its wild progenitor, the Bock -Dove, in regard to the speed of its flight. Von Middendorf's calculations on the speed of migrants, to which Her Gatke objects, may be taken as fairly accurate in spite of the remarks of the latter. But they refer to another feature of the phenomena i. E. , what may be described as the rate at which the breeding grounds are re-colonised every spring. His estimates will be found to be confirmed by the researches of American ornithologists (vide "Bird Migration in the Mississippi Valley, " Cooke).
What to read after The Migration of Birds a Consideration of Herr G Atkes Views?
You can find similar books in the "Read Also" column, or choose other free books by F B Whitlock to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
" This, he thinks, must be the case 92 owing to its having been in a domestic state for so many genera- tions. He quite overlooks the fact, however, that in this parti- cular strain the efforts of breeders have been directed towards one goal, i. E. , obtaining the fastest possible flyers. To accom- plish this, for many generations artificial selection has been unceasingly at work, breeders mating only their best birds. It seems, therefore, more probable that, as in the case of the wild horse an...d English race-horse, the domestic Carrier-Pigeon can beat its wild progenitor, the Bock -Dove, in regard to the speed of its flight. Von Middendorf's calculations on the speed of migrants, to which Her Gatke objects, may be taken as fairly accurate in spite of the remarks of the latter. But they refer to another feature of the phenomena i. E. , what may be described as the rate at which the breeding grounds are re-colonised every spring. His estimates will be found to be confirmed by the researches of American ornithologists (vide "Bird Migration in the Mississippi Valley, " Cooke).
What to read after The Migration of Birds a Consideration of Herr G Atkes Views?
You can find similar books in the "Read Also" column, or choose other free books by F B Whitlock to read onlineMoreLess
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