. The development of the chick; an introduction to embryology. Birds -- Embryology. DEVELOPMENT PRIOR TO LAYING 51 entoderm and the periblast proper as weU. We shall follow this usage and distinguish two parts of the Fig. 24. — Part of the mar2;in of a horizontal section through the blastoderm of a pigeon's egg about 25 hours after fertilization ( ). (After Blount.) 1, Periblast nuclei. 2, 3, Cells organized in the periblast. 4, A cell apparently added to the blastoderm from the periblast. 5, Vacuoles. In later stages the inner margin of the periblast becomes much less stee

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. The development of the chick; an introduction to embryology. Birds -- Embryology. DEVELOPMENT PRIOR TO LAYING 51 entoderm and the periblast proper as weU. We shall follow this usage and distinguish two parts of the Fig. 24. — Part of the mar2;in of a horizontal section through the blastoderm of a pigeon's egg about 25 hours after fertilization ( ). (After Blount.) 1, Periblast nuclei. 2, 3, Cells organized in the periblast. 4, A cell apparently added to the blastoderm from the periblast. 5, Vacuoles. In later stages the inner margin of the periblast becomes much less steep, owing apparently to active proliferation of cells. This is illustrated in the outline drawings of Fig. 25. Later yet 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 Lillie, Frank Rattray, 1870-1947. New York, Holt

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