The Journal of experimental zoology . EVOLUTION WITHOUT MUTATION.^ C. B. DAVENPORT. Professor de Vries having found in nature races that seem tohave arisen suddenly, fully formed, and having repeatedlyobserved mutating individuals that breed true, declares, in his Mutationstheorie, for the universality of mutation as themethod of phylogenetic differentiation. He says (1901, p. 139):a gradual origin of elementary species is not yet known but verymany cases are known in which species have suddenly made theirappearance. Nach der Mutationstheorie sind die Arten nichtdurch allmahlige, wahrend Jahrh
The Journal of experimental zoology . EVOLUTION WITHOUT MUTATION.^ C. B. DAVENPORT. Professor de Vries having found in nature races that seem tohave arisen suddenly, fully formed, and having repeatedlyobserved mutating individuals that breed true, declares, in his Mutationstheorie, for the universality of mutation as themethod of phylogenetic differentiation. He says (1901, p. 139):a gradual origin of elementary species is not yet known but verymany cases are known in which species have suddenly made theirappearance. Nach der Mutationstheorie sind die Arten nichtdurch allmahlige, wahrend Jahrhunderte oder Jahrtausendefortgesetzte Selection entstanden sondern stufenweise, durchplotzliche, wenn auch ganz kleine Umwandlungen. The mutation theory as a sufficient theory of evolution hasmany supporters. Bateson has long urged a theory of this sortas a result of his studies, particularly on the data collected in hisMaterials for the Study of Variation, 1894. In his recent bookEvolution and Adaptation Morgan adopts de Vries views
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