The principles of biology . rences in the conditionsare the causes of the differ-ences in the fbrms. Composite flowers furnishevidence so nearly allied tothat which clustered flowersfurnish, that we may fitly glance at them under the samehead. Such a common type of this order as the Sun-flower,exemplifies the extremely marked differ-? ence that arises in many of these plantsbetween the closely-packed internalflorets, each similarly circumstanced onall sides, and the external florets, notsimilarly circumstanced on aU Fig. 253, representing the inner andouter florets of a Daisy, the con
The principles of biology . rences in the conditionsare the causes of the differ-ences in the fbrms. Composite flowers furnishevidence so nearly allied tothat which clustered flowersfurnish, that we may fitly glance at them under the samehead. Such a common type of this order as the Sun-flower,exemplifies the extremely marked differ-? ence that arises in many of these plantsbetween the closely-packed internalflorets, each similarly circumstanced onall sides, and the external florets, notsimilarly circumstanced on aU Fig. 253, representing the inner andouter florets of a Daisy, the contrast ismarked between the small radial corolla of the one and thelarger bilateral corolla of the other. In many cases, how-ever, this contrast is less marked: the inner florets having * I had intended here to insert a figure exhibiting these differences; but as theCow-parsnip does not flower till July, and as I can find no drawing of the umbelwhich adequately represents its details, I am obliged to take another
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectbiology, bookyear1864
