. Biological lectures delivered at the Marine Biological Laboratory of Wood's Holl [sic]. Biology. r>-i fc >?^ C-i-S" 'i-v--. Fig. 3. — (a) Protoplasm and yolk-spheres from the egg of Tlialassevia in section. The upper part of the section shows the result of prolonged extraction of the dye (iron-haematoxylin), the lower half represents varying degrees of extraction (1200 diameters); (b) egg of Nereis in section showing yolk-spheres and the first polar amphiaster above (600 diameters). sperm-aster of echinoderms, the centre of the aster remains very small, and the nucleus still c
. Biological lectures delivered at the Marine Biological Laboratory of Wood's Holl [sic]. Biology. r>-i fc >?^ C-i-S" 'i-v--. Fig. 3. — (a) Protoplasm and yolk-spheres from the egg of Tlialassevia in section. The upper part of the section shows the result of prolonged extraction of the dye (iron-haematoxylin), the lower half represents varying degrees of extraction (1200 diameters); (b) egg of Nereis in section showing yolk-spheres and the first polar amphiaster above (600 diameters). sperm-aster of echinoderms, the centre of the aster remains very small, and the nucleus still consists of a compact mass of chro- matin (Fig. 4). It is more probable that they grow at the tip, continually extending themselves at the cost of the material lying in the meshwork. When the rays are followed out periph-. 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 Marine Biological Laboratory (Woods Hole, Mass. ). Boston, Ginn & Co
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectbiology
