. The cell in development and inheritance. Cells. 1/4 THE GERM-CELLS of the ensuing division-spindle. They seem, however, to have no part in the formation of the mitotic figure or in division, and both. Fig. 88. — Formation of the spermatozoids in the vascular cryptogams, Marsilia {A, D, E-G, Belajeff; B, C, O, Shaw), Gymnogramme {H-K, Belajeff), and Equisetufn {L-N, Belajeff). A. Primary spermatogonium (two generations before the primary spermatocytes) in division, showing centrosomes. B. Primary spermatocyte with pair of " blepharoplastoids" (centrosomes). C. Spindle of primary spe
. The cell in development and inheritance. Cells. 1/4 THE GERM-CELLS of the ensuing division-spindle. They seem, however, to have no part in the formation of the mitotic figure or in division, and both. Fig. 88. — Formation of the spermatozoids in the vascular cryptogams, Marsilia {A, D, E-G, Belajeff; B, C, O, Shaw), Gymnogramme {H-K, Belajeff), and Equisetufn {L-N, Belajeff). A. Primary spermatogonium (two generations before the primary spermatocytes) in division, showing centrosomes. B. Primary spermatocyte with pair of " blepharoplastoids" (centrosomes). C. Spindle of primary spermatocyte (first maturation-division). D. Four of the eight secondary spermatocytes with blepharoplast. £-G. Prophase of second maturation-division. N. Pair of spermatids ( Gymnogra7nn!e) with blepharoplasts. I-J. Formation of the ciliated band from the blepharoplast. K. Nearly ripe spermatozoid, showing ciliated band (b), nucleus, and "cyto- plasmic vesicle" (the latter is uhimately cast off). L. M. Spermatids of Equisetum. N. Ripe spermatozoid from above, showing spiral ciliated band. O. Ripe spermatozoid of Marsdia with very long spiral ciliated 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
