. Analysis of development. Embryology; Embryology. Gametogenesis, Fertilization and Parthenogenesis 199 gen) upon fertilization in the sea urchin Paracentrotus lividus. Expressed as glucose the breakdown in the first 10 minutes after fertilization averages mg. per 100 mg. of egg nitrogen (= cc. of eggs = 5 X 10^ eggs = gm. dry weight of eggs), whereas during the next 3 hours it is less than 3 per cent of that value (see Fig. 65). If completely oxidized this breakdown would be more than ample to account for the oxygen uptake fol- lowing fertilization. The available data on FUSION OF
. Analysis of development. Embryology; Embryology. Gametogenesis, Fertilization and Parthenogenesis 199 gen) upon fertilization in the sea urchin Paracentrotus lividus. Expressed as glucose the breakdown in the first 10 minutes after fertilization averages mg. per 100 mg. of egg nitrogen (= cc. of eggs = 5 X 10^ eggs = gm. dry weight of eggs), whereas during the next 3 hours it is less than 3 per cent of that value (see Fig. 65). If completely oxidized this breakdown would be more than ample to account for the oxygen uptake fol- lowing fertilization. The available data on FUSION OF PRONUCLEI Very little is known concerning the factors responsible for the union of the pronuclei within the egg. Here again attractive in- fluences have been proposed. However, it is known that the egg nucleus in artificially activated eggs can migrate in the same manner as if it were fertilized. Similarly, upon fertilization of non-nucleated eggs the sperm nucleus attains a normal position for. 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 Willier, Benjamin H. (Benjamin Harrison), b. 1890. Philadelphia, Saunders
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