The Migration of Birds; a Consideration of Herr Gätke's Views
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Severzoff, as regards Central Asia ; and Dr. Menzbier as regards Eastern Europe ; or, again, by Von Middendorff, who, after selecting seven typical species, found that in the middle of Siberia the general direction of the usual migrants is almost due north, in the east of Siberia from south-east to north-west, and in European Eussia from south-west to north-east. Prof. Palmen's conclusions are similar.
"Whether we accept the theories of the latter as to the manner in which birds are guided, or ...not, is of little importance at the present juncture, and does not affect the accuracy of his state- ments on the direction of the migratory flight.
It is no doubt true, as pointed out by Dr. Menzbier, that there are no such things as fly-lines. Probably every species goes its own way, and what is called a migration route is only the co- incidence of the way taken by many (Newton, "Dictionary of Birds "). How Herr Gatke, however, can formulate a theory of a migration carried out in a broad front, corresponding to the lati- tudinal area of the breeding-ground, and rigidly conducted in an east-to-west direction, in the face of the heterogeneous assem- blage of individuals and species which pass with such regularity and in such wonderful proportions at his little island, is im- possible to imagine.
What to read after The Migration of Birds; a Consideration of Herr Gätke's Views?
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To quickly assess the difficulty of the text, read a short excerpt:
Severzoff, as regards Central Asia ; and Dr. Menzbier as regards Eastern Europe ; or, again, by Von Middendorff, who, after selecting seven typical species, found that in the middle of Siberia the general direction of the usual migrants is almost due north, in the east of Siberia from south-east to north-west, and in European Eussia from south-west to north-east. Prof. Palmen's conclusions are similar.
"Whether we accept the theories of the latter as to the manner in which birds are guided, or ...not, is of little importance at the present juncture, and does not affect the accuracy of his state- ments on the direction of the migratory flight.
It is no doubt true, as pointed out by Dr. Menzbier, that there are no such things as fly-lines. Probably every species goes its own way, and what is called a migration route is only the co- incidence of the way taken by many (Newton, "Dictionary of Birds "). How Herr Gatke, however, can formulate a theory of a migration carried out in a broad front, corresponding to the lati- tudinal area of the breeding-ground, and rigidly conducted in an east-to-west direction, in the face of the heterogeneous assem- blage of individuals and species which pass with such regularity and in such wonderful proportions at his little island, is im- possible to imagine.
What to read after The Migration of Birds; a Consideration of Herr Gätke's 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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