Archive image from page 68 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 DEVELOPMENT PRIOR TO LAYING 51 thus distinguish a syncytial, more peripheral, and a cellular, more central, portion of the germ-wall. Fig. 24. — Part of the margin 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 late

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Archive image from page 68 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 DEVELOPMENT PRIOR TO LAYING 51 thus distinguish a syncytial, more peripheral, and a cellular, more central, portion of the germ-wall. Fig. 24. — Part of the margin 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 central margin of the syncytial part of the germ-wall becomes much less steep, owing apparently to active proliferation of cells. This is illustrated in Fig. 25. Later yet

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