. The cell in development and inheritance. Cells. ' 'l \. Z> Fig. 21. —The prophases in cells (spermatogonia and spermatocytes) of the salamander. [DrUner.] A. Spermatogonium in the spireme-stage; the chromatin-thread lies in the linin-network, still surrounded by the membrane; above, the two centrosomes, the central spmdle not yet formed. B. Later stage (spermatocyte) ; the nuclear membrane has disappeared, leaving the naked chro- mosomes; above, the amphiaster, with centrosomes and central spindle; astral rays extending towards the chromosomes. D. Following stage; splitting of the chromos
. The cell in development and inheritance. Cells. ' 'l \. Z> Fig. 21. —The prophases in cells (spermatogonia and spermatocytes) of the salamander. [DrUner.] A. Spermatogonium in the spireme-stage; the chromatin-thread lies in the linin-network, still surrounded by the membrane; above, the two centrosomes, the central spmdle not yet formed. B. Later stage (spermatocyte) ; the nuclear membrane has disappeared, leaving the naked chro- mosomes; above, the amphiaster, with centrosomes and central spindle; astral rays extending towards the chromosomes. D. Following stage; splitting of the chromosomes, growth of the aster; mantle-fibres and central spindle clearly distinguished. C. The fully formed mitotic figure (metaphase) ; the chromosomes, fully divided, grouped in the equatorial plate. corpuscle as forming a permanent organ, not only of the early blas- tomeres, but of all cells; that it constitutes a cell-organ equal in rank to the nucleus itself ; that every central corpuscle is derived from a pre-existing corpuscle, every attraction-sphere from the pre-existing. 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
