. Comparative anatomy. Anatomy, Comparative. REPRODUCTION 6i times that of an egg of Amphioxus. The greater part of the increased bulk is yolk. The egg (Fig. 38) is strongly polarized with reference to the distribution of the yolk in the protoplasm. From the animal pole where yolk is at a minimum the quantity increases toward the opposite vegetal pole where the maximum occurs. Yolk is a non-living, quite inert substance. The active material in development is protoplasm. The developmental behavior of eggs con- ANIMAL POLE. Please note that these images are extracted from scanned page images tha

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. Comparative anatomy. Anatomy, Comparative. REPRODUCTION 6i times that of an egg of Amphioxus. The greater part of the increased bulk is yolk. The egg (Fig. 38) is strongly polarized with reference to the distribution of the yolk in the protoplasm. From the animal pole where yolk is at a minimum the quantity increases toward the opposite vegetal pole where the maximum occurs. Yolk is a non-living, quite inert substance. The active material in development is protoplasm. The developmental behavior of eggs con- ANIMAL POLE. 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 work.. Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son