. The cell in development and inheritance. Cells. >f^J'5->tf SwA^v':, .:â . - ^\ ; I';, ^y-\ ^%<Ja -^i; â \-J;::y^''^&A<^-^-''' F Fig. 28. â Metaphase and anaphases of mitosis in cells (spermatocytes) of the salamander. [Druner.] E. Metaphase. The continuous central spindle-fibres pass from pole to pole of the spindle. Outside them the thin layer of contractile mantle-fibres attached to the divided chromosomes, of which only two are shown. Centrosomes and asters. F. Transverse section through the mitotic figure showing the ring of chromosomes surrounding the central spindle, th
. The cell in development and inheritance. Cells. >f^J'5->tf SwA^v':, .:â . - ^\ ; I';, ^y-\ ^%<Ja -^i; â \-J;::y^''^&A<^-^-''' F Fig. 28. â Metaphase and anaphases of mitosis in cells (spermatocytes) of the salamander. [Druner.] E. Metaphase. The continuous central spindle-fibres pass from pole to pole of the spindle. Outside them the thin layer of contractile mantle-fibres attached to the divided chromosomes, of which only two are shown. Centrosomes and asters. F. Transverse section through the mitotic figure showing the ring of chromosomes surrounding the central spindle, the cut fibres of the latter appearing as dots. G. Anaphase; divergence of the daughter-chromosomes, exposing the cen- tral spindle as the interzonal fibres; contractile fibres (principal cones of \'an Beneden) clearly shown. H. Later anaphase (dyaster of Flemming) ; the central spindle fully exposed to view- mantle-fibres attached to the chromosomes. Immediately aftenvard the cell divides (see Fig. 29) . chromosomes proceed, and within their respective spheres of influ- ence are formed the resulting daughter-cells. Both Van Beneden and Boveri fully recognized the importance of their discovery. "We are justified," said Van Beneden, "in regarding the attraction-sphere with its central corpuscle as forming a permanent organ, not only of the early blastomeres, but of all cells, and as constituting a cell-organ equal. 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, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcells, bookyear1911
