. The biology of the cell surface. Cytology. 'â .â »:: â â â¢f\â.: ls',«' â - â¢^^â .â â¢.a'.; ~' * â '-"â. a b Fig. 26.âSperm-nucleus within the egg of Nereis (after Lillie); a, with cone attached and h, separated from cone. enlarges, losing its staining power. In the meantime, the entrance-cone has disappeared. The egg-nucleus during the progress of these events has undergone changes. First, as germinal vesicle, it breaks down. The first maturation spindle forms near the centre of the egg and moves to the animal pole where the first polar body and, after the formation of the s
. The biology of the cell surface. Cytology. 'â .â »:: â â â¢f\â.: ls',«' â - â¢^^â .â â¢.a'.; ~' * â '-"â. a b Fig. 26.âSperm-nucleus within the egg of Nereis (after Lillie); a, with cone attached and h, separated from cone. enlarges, losing its staining power. In the meantime, the entrance-cone has disappeared. The egg-nucleus during the progress of these events has undergone changes. First, as germinal vesicle, it breaks down. The first maturation spindle forms near the centre of the egg and moves to the animal pole where the first polar body and, after the formation of the second matura- tion spindle, also the second is given off. The chromosomes remaining in the egg constitute the egg-nucleus. The union of egg- and sperm-nucleus follows and thus arises the first ^ Just, 1933b. But cf. Lillie, igi2. 163. 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 Just, Ernest Everett, 1883-1941. Philadelphia, P. Blakiston's son & co. , inc
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