. The cell in development and inheritance. Cells. 168 THE GERM-CELLS " archoplasm " of the spcrnialid. Su/uki's studies clearly show, how- ever, that the entire axial iilaiiient of the lon^ middle-piece arises by the elongation of the inner centrosonie, while the outer centrosome, from which the axial filament of the tail grows out, lies at the pos- terior limit of the middle-piece (Fig. 85). A nearly similar result is reached by Korff ('99) in the case of Helix. It was shown by (lod- lewski ("97) that in this form the axial filament likewise grows out. Fig. 85. — Formation of t
. The cell in development and inheritance. Cells. 168 THE GERM-CELLS " archoplasm " of the spcrnialid. Su/uki's studies clearly show, how- ever, that the entire axial iilaiiient of the lon^ middle-piece arises by the elongation of the inner centrosonie, while the outer centrosome, from which the axial filament of the tail grows out, lies at the pos- terior limit of the middle-piece (Fig. 85). A nearly similar result is reached by Korff ('99) in the case of Helix. It was shown by (lod- lewski ("97) that in this form the axial filament likewise grows out. Fig. 85. — Formation of the spermatozoon in elasmobranchs. [.4-C Suzltki; Z), Moore; and in Helix, E-G, KORFF.] A-D. Outgrowth of axial filament from peripheral centrosome (f 1), which persists at the posterior limit of the middle-piece or connecting-piece (w). Elongation of inner centrosome (c2) to lorm the axial filament of the latter. E-G show similar phenomena in Helix, with casting off of the sphere (s). <7. Acrosome; ci. peripheral, and c". inner centrosome; f. flagellum ; k. end-knob, derived from inner centrosome. from the centrosome. Korff's later studies show that here, exactly as in the elasmobranch, the axial filament grows out from the periph- eral centrosome and is afterward transformed into a ring (Fig. 85). The inner centrosome elongates to form a rod, which afterward becomes a long filament traversing" the elongated middle-piece and terminating in front in an end-knob at the base of the nucleus, while the ring lies at its posterior limit. The idiozome (a true attraction- sphere) degenerates without taking part in the formation of an aero-. 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, bookdecade1900, booksubjectcells, bookyear1906
