02428cam a22003613u 4500 7234 UtSlPG 20260610133204.0 m cr n 260607r2005||||utu|||||o|||||||||||||| d UtSlPG en iso639-1 QH QK Vries, Hugo de, 1848-1935 Species and Varieties, Their Origin by Mutation Salt Lake City, UT : Project Gutenberg, 2005 1 online resource : multiple file formats text txt rdacontent computer c rdamedia online resource cr rdacarrier Release date is 2005-01-01 Produced by Dave Gowan "Species and Varieties, Their Origin by Mutation" by Hugo de Vries is a scientific publication written in the early 20th century. The book presents lectures focused on the theory of mutation as a key mechanism for the origin of species and varieties, challenging the slow change model proposed by Darwin and others. De Vries argues for sudden mutations that generate new species, suggesting that the processes underlying species formation can be experimentally investigated, particularly in agricultural and horticultural contexts. The opening of the work introduces the premise of mutation theory, highlighting how it diverges from traditional evolutionary thought. De Vries outlines his intention to demonstrate that new species and varieties arise suddenly, rather than through gradual changes, and he emphasizes the importance of empirical research and controlled experiments in this context. He also critiques the limitations of existing theories of descent, particularly Darwin's reliance on gradualism, by insisting that the experimental observation of mutative processes offers a more fruitful approach for understanding evolutionary biology. The author sets the stage for further explorations into specific examples, methodologies, and implications of his findings throughout the rest of the lectures. (This is an automatically generated summary.) Original publication data not identified Evolution (Biology) Plants -- Variation Plant mutation Plant hybridization Plants -- Evolution MacDougal, Daniel Trembly, 1865-1958 https://www.gutenberg.org/ebooks/7234 49225 49225