File:Annual report of the Board of Regents of the Smithsonian Institution (1908) (14770055812).jpg

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Identifier: annualreportofbo1908smitfo (find matches)
Title: Annual report of the Board of Regents of the Smithsonian Institution
Year: 1846 (1840s)
Authors: Smithsonian Institution. Board of Regents United States National Museum. Report of the U.S. National Museum Smithsonian Institution. Report of the Secretary
Subjects: Smithsonian Institution Smithsonian Institution. Archives Discoveries in science
Publisher: Washington : Smithsonian Institution
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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Fig. 1.—Oenothera Lainarckiana, the parental form which is giving off many mutants.A, B, and C, leaves from rosette; D, leaf from middle of flowering stem ; E, bract;F, flower with petals removed ; G, petal. well justify the tedious care by which lines of descent were carriedthrough successive generations for two decades without allowing atrace of doubt as to the purity of the lineage involved. HEREDITY, AND THE ORIGIN OP SPECIES—MACDOUGAL. 511 During the last four years a partial duplication and an extensionof these experiments has been carried on in New York. It seemsunnecessary at this late date to go into the detail of the mutations ofLamarcks evening primrose, especially since the phenomena exhibited
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Pig. 2.—Oenothera ruhrinervis, one of the mutants of 0. Lamarckiana. A, B, and C, leavesfrom rosette; D, leaf from middle of flowering stem; F, flower with petals removed:G, petal. by them are also to be seen in many other species. By way of illus-tration it need only be said that this plant, as originally observed byDe Vries, was found to give from two to five plantlets in every hun-dred which were widely divergent from the type, and could, upon 512 ANNUAL, REPORT SMITHSONIAN INSTITUTION, 1908. maturity, be arranged in several groups, and in fact constitutedseveral possible species. One, scintiUans, was eversporting, and con-tinuously and consistently gave rise to a variety of forms in itsprogeny, which included the parent and its mutants. Another, lata,

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1908
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28 July 2014

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