The cell in development and inheritance . t„- o^^ ?So « i* o * <9- ^ 90 c Fig. 81. — Forms of yolk-nuclei in Limulus and Polyzonium. [,^-C, MUNSON; D-F, Nemec]A. Very young ovarian eggs oiLimulus; at the left vitelline body {v) in the form of a capon the nucleus; at the right older egg showing astral formation. B. Older stage of the same;vitelline body in the form of an attraction-sphere with central granule. C. Peripheral yolk-nuclei (^.w.) in Limulus. D. Very early ovarian egg of a myriapod, Polyzonium, with yolk-nucleus. E. Older egg with yolk-nucleus and astral body \a). F. Still later
The cell in development and inheritance . t„- o^^ ?So « i* o * <9- ^ 90 c Fig. 81. — Forms of yolk-nuclei in Limulus and Polyzonium. [,^-C, MUNSON; D-F, Nemec]A. Very young ovarian eggs oiLimulus; at the left vitelline body {v) in the form of a capon the nucleus; at the right older egg showing astral formation. B. Older stage of the same;vitelline body in the form of an attraction-sphere with central granule. C. Peripheral yolk-nuclei (^.w.) in Limulus. D. Very early ovarian egg of a myriapod, Polyzonium, with yolk-nucleus. E. Older egg with yolk-nucleus and astral body \a). F. Still later stage, beginningdisintegration of the yolk-nucleus. nucleus hke those described above, while the other assumes thestructure of a radiating attraction-sphere containing a centralgranule (centrosome .?), and his observations suggest that the twobodies in question may have a common origin (Fig. 81). In noneof these cases do the astral radiations, surrounding this body, seemto have any connection with cell-division, and it is probable
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcells, bookyear1902
