. The cell in development and inheritance. Cells. 166 THE GERM-CELLS consisting of three parts, lying side by side in the cytoplasm (Fig. 83). These are {a) a colourless sphere, shown by Meves's later researches to be probably an attraction-sphere ; (/>) a minute, intensely staining cor- puscle, and (r) a small, deeply staining ring. The concurrent results of Hermann ('89, '92, '97), Benda ('93), and Meves ('96, '97, 2) have shown that the small corpuscle {c) is one of the centrosomes of the spermatid, and all these observers agree that it passes into or gives. / y n w^ Fig. 84. — Formation
. The cell in development and inheritance. Cells. 166 THE GERM-CELLS consisting of three parts, lying side by side in the cytoplasm (Fig. 83). These are {a) a colourless sphere, shown by Meves's later researches to be probably an attraction-sphere ; (/>) a minute, intensely staining cor- puscle, and (r) a small, deeply staining ring. The concurrent results of Hermann ('89, '92, '97), Benda ('93), and Meves ('96, '97, 2) have shown that the small corpuscle {c) is one of the centrosomes of the spermatid, and all these observers agree that it passes into or gives. / y n w^ Fig. 84. — Formation of the spermatozoon in Amphibia. [A-E. Salaviandra, MEVES; F-K. Amphuima, McGrec;or.] A. Spermatid with peripheral pair of centrosomes lying outside the sphere, and axial filament. B. Centrosomes near the nucleus, outer one ring-shaped. C. Inner centrosome inside the nucleus, enlarging to form middle-piecei D. Portion of much older spermatid, showing divergence of two halves of the ring (;-). E. Portion of mature spermatozoon, showing upper half of ring at r, and the axial filament proceeding from it. F. Spermatid of Amphiuma, showing sphere-bridges and ring-shaped mid-bodies. G. Later stage ; outer centrosome ring-shaped, inner one double; sphere (j) converted into the acrosome. //. Migration of the centrosomes. /. Middle-piece at base of nucleus. % The inner centrosome forms the end-knob within the middle-piece, which is now inside the nucleus. K. Enlargement of middle-piece, end-knob within it; elongation of the 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
