Excerpt from Bursa Bursa-Pastoris and Bursa Heegeri Biotypes and Hybrids Darwin recognized in the facts of variation a key to the riddle presented by the multiformity and many obvious interrelations of all living things. Since the appearance of the Origin of Species the observation and discus sion of variations have assumed a dominant place in biology, and a serious conflict has recently developed regarding the interpretation of the observed facts. It is now generally recognized that this conflict can be ...
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Excerpt from Bursa Bursa-Pastoris and Bursa Heegeri Biotypes and Hybrids Darwin recognized in the facts of variation a key to the riddle presented by the multiformity and many obvious interrelations of all living things. Since the appearance of the Origin of Species the observation and discus sion of variations have assumed a dominant place in biology, and a serious conflict has recently developed regarding the interpretation of the observed facts. It is now generally recognized that this conflict can be brought to a termination only through the application of experimental methods. Inspection alone can not decide the question as to how an observed varia tion originated and what bearing it may have on the future of the race in which it occurs. Studies in the museum and in the field only discover the fact, and to some extent the range, of variation occurring under a more or less limited and inadequately known range of conditions, and can not cer tainly determine its cause or causes neither can these means supply more than a suggestion based upon insecure inference as to the hereditary nature of any variation. The causes of variation can be determined only by subjecting equivalent material to different controlled conditions, and their hereditary relations can be learned only through the conduct of pedigree cultures. We already know, as a result of experimental work in these directions, that variations are of fundamentally different types, having different causes and obeying different laws of development and heredity. A knowledge of these facts impresses an important principle, namely, that the range of applicability of any conclusion reached by the investigation of one class of material or one characteristic can be determined only by similar experiments with other material and other characteristics. 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 Bursa Bursapastoris and Bursa Heegeri Biotypes and to cart. $17.20, 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 Bursa Bursa-Pastoris and Bursa Heegeri Biotypes and to cart. $26.94, 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 Bursa Bursa-Pastoris and Bursa Heegeri Biotypes and to cart. $39.38, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2018 by Forgotten Books.
Add this copy of Bursa Bursa-Pastoris and Bursa Heegeri Biotypes and to cart. $54.05, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2018 by Forgotten Books.
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