. Anatomischer Anzeiger. Anatomy, Comparative. 538 karyokinetic figure of this stage when compared with that seen in Fig. 2 is most striking. From centrosome to centrosome the spindle of Fig. 2 measured 49 /li while in the stage shown in Fig. 3 the distance from the center of one centrosome to that of the other was 99 fjL. And not only has there been an increase in the length of the spindle, but both the astrocoels and the centrosomes have also increased greatly. The chromosomes have now a simple rod-like form, and the astrocoels are clear areas of considerable extent, in which only a few achr
. Anatomischer Anzeiger. Anatomy, Comparative. 538 karyokinetic figure of this stage when compared with that seen in Fig. 2 is most striking. From centrosome to centrosome the spindle of Fig. 2 measured 49 /li while in the stage shown in Fig. 3 the distance from the center of one centrosome to that of the other was 99 fjL. And not only has there been an increase in the length of the spindle, but both the astrocoels and the centrosomes have also increased greatly. The chromosomes have now a simple rod-like form, and the astrocoels are clear areas of considerable extent, in which only a few achromatic fibres can be seen, but at their periphery a somewhat granular zone, not represented in the figure and not very clearly distinguishable from the cytoplasm, could be made out. The astral rays have increased both in number apparently and in length, extending throughout the entire cytoplasm, those from each astrocoel seeming to cross to a certain extent opposite the equator of the spindle. The centrosomes, however, have undergone the most remarkable changes, and are now vesicular structures with perfectly homogeneous contents. From the periphery of each a number of achromatic fibres radiate out into the astrocoel, a deeply staining granule occurring at the point of insertion of each fibre into the wall of the centrosome. In Fig. 3 Fig. 3. Fig. Fig. 3. Karyokinetic spindle in which the chromosomes have almost reached the poles. The entire protoplasmic area is shown, the clear circles around it being yolk granules. The scale of this figure is half that of Fig. 2. Fig. 4. Centrosome from spindle represented in Fig. 3 showing the achromatic network on its surface. the centrosomes are represented as seen in optical section, but if the focus be altered its spherical form becomes apparent, and one gets the appearance represented in Fig. 4, which shows not only the deeply. Please note that these images are extracted from scanned page images that may have been digitally enhanced
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