. The cell in development and inheritance. Cells. \S*6* yl. r';-^ Fig. 77. — Ovarian eggs of insects. [Korschelt.] A. Egg of the butterfly, P'afiessa, surrounded by its follicle; above, three nurse-cells () with branching nuclei; £:v. germinal vesicle. B. Egg of water-beetle, Dytiscus, living; the egg {) lies between two groups of nutritive cells; the germinal vesicle sends amoeboid processes into the dark mass of food-srranules. the deutoplasm appears near the periphery and advances inward toward the nucleus. More commonly it first appears in a zone surrounding the nucleus (Fig. y'i,
. The cell in development and inheritance. Cells. \S*6* yl. r';-^ Fig. 77. — Ovarian eggs of insects. [Korschelt.] A. Egg of the butterfly, P'afiessa, surrounded by its follicle; above, three nurse-cells () with branching nuclei; £:v. germinal vesicle. B. Egg of water-beetle, Dytiscus, living; the egg {) lies between two groups of nutritive cells; the germinal vesicle sends amoeboid processes into the dark mass of food-srranules. the deutoplasm appears near the periphery and advances inward toward the nucleus. More commonly it first appears in a zone surrounding the nucleus (Fig. y'i, C, D) and advances thence toward the periphery (trout, Henneguy ; cephalopods, Ussow). In still others { in myriapods, Balbiani) it appears in irregular patches scattered quite irregularly through the ovum (Fig. J"^, A). In Branchipus the yolk is laid down at the centre of the ^gg, while the nucleus lies at the extreme periphery (Brauer). These variations show in general no definite relation to the ultimate arrangement — a fact which proves that the eccentricity of the nucleus and the polarity of the. 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 Wilson, Edmund B. (Edmund Beecher), 1856-1939. New York Macmillan
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcells, bookyear1906
