. The cell in development and inheritance. Cells. 266 CELL-DIVISION AND DEVELOPMENT the disc be elongated to form an ellipse, the periclines also become ellipses, while the anticlines are converted into hyperbolas confocal with the periclines. If it have the form of a parabola, the periclines and anticlines form two systems of confocal parabolas intersecting at. Fig. 119.— Geometrical relations of cleavage-planes in growing plant-tissues. [From Sachs, after various authors.] A. Flat ellipsoidal germ-disc of Melobesia (Rosanoff) : nearly typical relation of elliptic periclines and iiyperbolic a
. The cell in development and inheritance. Cells. 266 CELL-DIVISION AND DEVELOPMENT the disc be elongated to form an ellipse, the periclines also become ellipses, while the anticlines are converted into hyperbolas confocal with the periclines. If it have the form of a parabola, the periclines and anticlines form two systems of confocal parabolas intersecting at. Fig. 119.— Geometrical relations of cleavage-planes in growing plant-tissues. [From Sachs, after various authors.] A. Flat ellipsoidal germ-disc of Melobesia (Rosanoff) : nearly typical relation of elliptic periclines and iiyperbolic anticlines. B. C. Apical view of terminal knob on epidermal iiair of Pinguicola. B. shows the ellipsoid type, C. the circular (spherical type), somewhat modified (only anticlines present). D. Growing point of Salvinia (Pringsheim) ; typical ellipsoid type, the single pericline is however incomplete. E. Growing point of Azolla (Strasburger); circular or spheroidal type transitional to ellipsoidal. F. Root-cap of Eqiiisetum (Niigeli and Leitgeb) ; modified circular type. G. Cross-section of leaf-vein, Triclioinanes (Prantl) ; ellipsoidal type with incomplete periclines. H. Embryo of Alismci; typical ellipsoid type, pericline incomplete only at lower side. /. Growing point of bud of the pine {Ad/£s) ; typical paraboloid type, both anti- clines and periclines having the form of parabolas (Sachs). right angles. All these schemes are, mutatis mutandis, directly con- vertible into the corresponding solid forms in three dimensions. Sachs has shown in the most beautiful manner that all the above ideal types are closely approximated in nature, and Rauber has applied. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wilson, Edmund B. (Edmund Beecher), 1856-1939. New York : The Macmillan company
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectcells, bookyear1896
