Archive image from page 68 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 DEVELOPMENT PRIOR TO LAYING 51 entoderm and the periblast proper as weU. We shall follow this usage and distinguish two parts of the germ-wall. 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, Vacuol

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Archive image from page 68 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 DEVELOPMENT PRIOR TO LAYING 51 entoderm and the periblast proper as weU. We shall follow this usage and distinguish two parts of the germ-wall. 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

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