. The cell in development and inheritance. Cells; Cells. 58 CELL-DIVISION represents the centrosome alone. In other cases the granule is sur- rounded by a larger body, which in turn lies within the centrosphere or attraction-sphere. In still other cases the centre of the aster is occupied by a large reticular mass, within which no smaller body can be distinguished { in pigment-cells); this mass is sometimes called the centrosome, sometimes the centrosphere. Sometimes, again, the. Fig. 24. — The middle phases of mitosis in the first cleavage of the Ascaris-ftg^. [BOVERI.] A. Closing prophas
. The cell in development and inheritance. Cells; Cells. 58 CELL-DIVISION represents the centrosome alone. In other cases the granule is sur- rounded by a larger body, which in turn lies within the centrosphere or attraction-sphere. In still other cases the centre of the aster is occupied by a large reticular mass, within which no smaller body can be distinguished { in pigment-cells); this mass is sometimes called the centrosome, sometimes the centrosphere. Sometimes, again, the. Fig. 24. — The middle phases of mitosis in the first cleavage of the Ascaris-ftg^. [BOVERI.] A. Closing prophase, the equatorial plate forming. B. Metaphase; equatorial plate estab- lished and the chromosomes split; b, the equatorial plate, viewed en face, showing the four chro- mosomes. C. Early anaphase; divergence of the daughter-chromosomes (polar body at one side). D. Later anaphase ; ;).3., second polar body. (For preceding stages see Fig. 65; for later stages. Fig. 104.) spindle-fibres are not focussed at a single point, and the spindle appears truncated at the ends, its fibres terminating in a transverse row of granules (maturation-spindles of Ascaris, and some plant-cells). It is not entirely certain, however, that such spindles observed in preparations represent the normal structure during life.^ 1 Hacker asserts in a recent paper ('94) that the truncated polar spindles are normal, and that a centrosome lies at each of the four angles; two at either 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
