Elementary biology; an introduction to Elementary biology; an introduction to the science of life elementarybiolog00grue Year: 1924 . rubrl- lamarcki- scinlit- gigas nlbida obTonga. nervis ana nanclla lata' lans 4th Generation 1895-1896 i 3d Generation 1890-1891 2d Generation 1888-1889 Ist Generation 1886-1887 Fig. 247. Mutation in evening primrose In jS86 Hugo de Vries gathered the seeds from a number of evening primroses (CEnothera lamarckiana) which he found growing in a vacant lot. These plants are natives of North America, and probably escaped from some Dutch garden. From seeds thus o
Elementary biology; an introduction to Elementary biology; an introduction to the science of life elementarybiolog00grue Year: 1924 . rubrl- lamarcki- scinlit- gigas nlbida obTonga. nervis ana nanclla lata' lans 4th Generation 1895-1896 i 3d Generation 1890-1891 2d Generation 1888-1889 Ist Generation 1886-1887 Fig. 247. Mutation in evening primrose In jS86 Hugo de Vries gathered the seeds from a number of evening primroses (CEnothera lamarckiana) which he found growing in a vacant lot. These plants are natives of North America, and probably escaped from some Dutch garden. From seeds thus obtained about 15,000 ordinary lamarckiana plants were grown, and in addition five peculiar dwarfed individuals {nanclla) and five with broad leaves {lata). These two sets were different from the parents as well as from any other known varieties of CEnothera. Later these new forms appeared again in very small numbers from very large sowings of lamarckiana seeds (third and fourth generations). In the third sowing (1S90) another new form appeared, having reddish veins {ritbrincn<is). In the same manner new types have appeared in each succeeding generation, and some of these types appeared anew several times. By means of careful breeding it was possible to preserve the new quali- ties, and to recombine them with one another and with the contrasting characters of the parent type according to the Mendelian principles
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