Mutants And Hybrids of the Oenotheras

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08 ± 0. 30 mm. ; C. V. , 13. 60 ± 0. 81 per cent. O. Rubrinervis : R. , 63 to 142 mm. ; M. , 97. 99 ± 0. 34 mm. ; o-, 12. 87 ± 0. 24 mm. ; C. V. , 12. 62 ± 0. 24 per cent .
lamarckiana is noticeably thicker than that of 0. Rubrinervis. So- called qualitative differences are usually compounds of several meas- urable characters, any one of which is a wholly unsatisfactory measure of the quality, while only one, two, or several at most of these measurable characters can be dealt with mathe- matica
...lly at a time. Leaf- form is a character of this kind. Not only is the relation of length to breadth important, but the relative posi- tion of the widest part of the leaf, the angles of apex and base, and indeed the curvature of the mar- gin at every point from petiole to apex, enter as essential features of leaf- form, and no tangible mathe- matical expression can be devised to represent it. Confining ourselves to a single measurable character, such as leaf length or breadth, there is still another difficulty which must be met.

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