. Eine Einführung in die Struktur und die Fortpflanzung von Pflanzen. Anlage Anatomie; Pflanzen. 376 VARIATION (Abb. 220). Je größer die Anzahl der Personen berücksichtigt, desto reibungsloser wird der Umriss der Kurve. Derartige variation Kurven werden in der Regel symmetrische (Abb. 220, links), aber Sie kann einseitig oder asymmetrisch (Abb. 220, rechts), wie im Fall der meristic Variation der Corolla-Segmente der vielen Blumen, in denen sich oft relativ wenige Beispiele mit weniger als die normale Anzahl der Teile. Die eng Chance, Lal svmmetrical Kurve der Variation stimmt sehr mit, dass eine Funktion.

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. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. 376 VARIATION (Fig. 220). The larger the number of individuals taken into account, the smoother the outline of the curve. Such variation curves are most commonly symmetrical (Fig. 220, left), but they may be one-sided or asymmetrical (Fig. 220, right), as in the case of the meristic variation of the corolla-segments of many flowers, where there are often relatively few examples with less than the normal number of parts. The closely chance, lal svmmetrical curve of variation agrees very with that a feature. representing variation depending on pure which in itself suggests that the manifold differences in the conditions of ; the environment are involved. The classical example of such chance variation is afforded by the repeated tossing up of two coins, the combination of one head and one tail being most frequent (forming about 50 per cent, of the cases), whilst the combinations two heads or two tails occur with about equal in- frequency. A more iUustrative curve of chance variation would be obtained if ten coins were tossed simultaneously for a large number of times in succession. In cases of meristic variation it will be noticed that the differ- ence between the extremes is much greater when the mode corresponds to a large number than when it coincides with a small one. Thus, if variation due to fission of parts (saj- of the corolla of a flower) be equal in two species, the one having a mode of five {i.e. usually five petals) and the other ha^•ing a mode of ten {i.e. usually ten petals), there would be just double the chances of fission occurring in the latter as in the former. The extreme condition [i.e. 10 and 20 petals) would be attained where all the petals imderwent fission. That is, the range would be greater in the one case than in the other, although the actual frequency of fission of the individual segments was the same Fig. 2ig.—Seeds of different varie- ties of Castor

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• bookdecade1920
• booksubjectpl
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