. The cell; outlines of general anatomy and physiology. Cells; Anatomy; Physiology; Cells; Anatomy; Physiology. Fig-. 106.—4 Mature Egg of an Echinoderm, containing in its yolk a very small nucleus (efc) (O. Hertwig, Emhnjol., Pig. 14). B Egg of a Sea-urchin, immediately after the close of fertilisation. Female pro-nucleus and male pro-nucleus have united to form the cleavage nucleus (/fc), which occupies the centre of a protoplasmic radiation. Polar diiferentiation consists in this, that the lighter protoplasm collects at one pole, and the heavier yolk substance at the other. They may be more
. The cell; outlines of general anatomy and physiology. Cells; Anatomy; Physiology; Cells; Anatomy; Physiology. Fig-. 106.—4 Mature Egg of an Echinoderm, containing in its yolk a very small nucleus (efc) (O. Hertwig, Emhnjol., Pig. 14). B Egg of a Sea-urchin, immediately after the close of fertilisation. Female pro-nucleus and male pro-nucleus have united to form the cleavage nucleus (/fc), which occupies the centre of a protoplasmic radiation. Polar diiferentiation consists in this, that the lighter protoplasm collects at one pole, and the heavier yolk substance at the other. They may be more or less sharply separated from one another. For instance, sections through the eggs of Amphibians do not show any striking separation, the only thing being, that in the one half the yolk plates are smaller, and are separated from each other by A. P. kb k, sell. 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 Hertwig, Oscar, 1849-1922; Campbell, M. , tr; Campbell, Henry Johnstone, 1859- ed. London, S. Sonnenschein & Co. ; New York, Macmillan & Co.
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