Species And Varieties Their Origin By Mutation Paperback - 2004

""Species and Varieties: Their Origin by Mutation"" is a scientific book written by Hugo de Vries, a Dutch botanist and geneticist. The book was published in 1905 and is considered a landmark in the field of evolutionary biology. The book focuses on de Vries' theory of mutation as the primary mechanism for the origin of new species and varieties. In this theory, de Vries argues that new species and varieties arise suddenly through large, heritable changes in the genetic material of an organism, rather than through gradual evolution over long periods of time. De Vries presents evidence from his own experiments with plant breeding, as well as data from other researchers, to support his theory of mutation. He also discusses the implications of his theory for the study of evolution and the classification of organisms. Overall, ""Species and Varieties: Their Origin by Mutation"" is a seminal work in the history of evolutionary biology, and remains an important reference for researchers and students in the field.From time to time the idea has suggested itself to some of the best authorities on the amelioration of plants, that this atavism was not due to an innate tendency, but, in many cases at least, was produced by crosses between neighboring varieties. It is especially owing to Verlot that this side of the question was brought forward. But breeders as a rule have not attached much importance to this supposition, chiefly because of the great practical difficulties attending any attempt to guard the species of the larger cultures against intermixture with other varieties. Bees and humble-bees fly from bud to bud, and carry the pollen from one sort to another, and separation by great distances would be required to avoid this source of impurity.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.