Excerpt from The Migrations of Birds The material included is based on study and ob servation on the part of the author during a period of more than twenty years. It is intended as a sum mary of present knowledge of migration, with the various factors that affect it in its broader aspects, without entering upon precise statistics of move ment for the many species involved. Such figures may be left for treatises of another character. After careful consideration of the subject the writer is profoundly impressed by the mass ...
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Excerpt from The Migrations of Birds The material included is based on study and ob servation on the part of the author during a period of more than twenty years. It is intended as a sum mary of present knowledge of migration, with the various factors that affect it in its broader aspects, without entering upon precise statistics of move ment for the many species involved. Such figures may be left for treatises of another character. After careful consideration of the subject the writer is profoundly impressed by the mass of detail regarding the movements of birds that has been assembled and the little that has been definitely ascertained regarding the underlying principles that control migration. There is much that remains to be established in this phase of the subject. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at ... This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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Add this copy of The Migrations of Birds (Classic Reprint) to cart. $21.21, new condition, Sold by Paperbackshop rated 4.0 out of 5 stars, ships from Bensenville, IL, UNITED STATES, published 2018 by Forgotten Books.
Add this copy of The Migrations of Birds (Classic Reprint) to cart. $31.21, new condition, Sold by Paperbackshop rated 4.0 out of 5 stars, ships from Bensenville, IL, UNITED STATES, published 2018 by Forgotten Books.
Add this copy of The Migrations of Birds (Classic Reprint) to cart. $58.43, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2018 by Forgotten Books.
