. Elementary biology; an introduction to the science of life . \'^ *!.' " i<v'i i^iv^,l'i'a''^Ji,i.•-. Fig. 235. Improved varieties of domestic birds seeds for further propagation. For one thing was certain : it was possible to improve the stocks to a considerable degree by constant selection (see Figs. 235, -236). 466. Mixed types. In the diagrams used to illustrate the measurement of variations (Figs. 231-234) we see that for eveiy series there is one measurement that represents the condition of a comparatively large number of individuals, This appears in the diagram as the peak of t
. Elementary biology; an introduction to the science of life . \'^ *!.' " i<v'i i^iv^,l'i'a''^Ji,i.•-. Fig. 235. Improved varieties of domestic birds seeds for further propagation. For one thing was certain : it was possible to improve the stocks to a considerable degree by constant selection (see Figs. 235, -236). 466. Mixed types. In the diagrams used to illustrate the measurement of variations (Figs. 231-234) we see that for eveiy series there is one measurement that represents the condition of a comparatively large number of individuals, This appears in the diagram as the peak of the curve. In many groups of individuals careful measurements will show two such peaks. For example, the Dutch botanist Hugo de Vries counted the number of ray-florets in a species of daisy (Chrysanthemiun segetum) and plotted the results of his count- ing, which are given graphically in Fig. 237 i
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishe, booksubjectbiology
