Fig. 2. Surface-view of a germinal disc with two furrows.
Figs. 3, 4, 5. Surface-views of three germinal discs in different stages of segmentation.
Fig. 6. Section through the germinal disc represented in fig 3. n. nucleus; x. edge of germinal disc. The engraver has not accurately copied my original drawings in respect to the structure of the segmentation furrows.
Figs. 6a and 6b. Two furrows of the same germinal disc more highly magnified.
Fig. 6c. A nucleus from the same germinal disc highly magnified.
Fig. 7. Section through a germinal disc of the same age as that represented in fig. 4. n. nucleus; nx. modified nucleus; nx´. modified nucleus of the yolk; f. furrow appearing in the yolk around the germinal disc.
Figs. 7a, 7b, 7c. Three segments with modified nuclei from the same germinal disc.
Fig. 8. Section through a somewhat older germinal disc. ep. epiblast; n´. nuclei of yolk.
Figs. 8a, 8b, 8c. Modified nuclei from the yolk from the same germinal disc.
Fig. 8d. Segment in the act of division from the same germinal disc.