The Danish plant scientist Wilhelm Johannsen (1857-1927) is remembered for his experimental work on plant heredity, and as a founding figure of modern genetics. The terms 'gene', 'genotype' and 'phenotype' were first used by him. The results of his studies on beans supported theories advanced during the 1890s by the Dutch botanist Hugo de Vries, who had unknowingly replicated the work of Gregor Mendel, published in English translation in 1902 (also reissued in this series) by William Bateson. Johannsen's proposal that changes in heredity resulted from sudden mutations rather than from slow processes of natural selection was seen at the time as a threat to Darwinian theory, though later research showed otherwise. This influential book, first published in 1909 (with later editions in 1913 and 1926), is a revised, expanded German translation of a 1905 Danish book by Johannsen, itself based on a journal article originally published in 1903.

This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book. ++++ The below data was compiled from various identification fields in the bibliographic record of this title. This data is provided as an additional tool in helping to ensure edition identification: ++++ Det Nittende Aarhundrede: Skildret Af Nordiske Videnskabsmaend, Volumes 16-18; Det Nittende Aarhundrede: Skildret Af Nordiske Videnskabsmaend; Aage Friis Johannes Christoffer Hagemann Reinhardt Steenstrup, Torsten Brod�n, Wilhelm Johannsen, Niels Janniksen Bjerrum, Elis Str�mgren Aage Friis Gyldendal, 1921