EGG CORTEX IN MORPHOGENESIS
373
between vegetal yolk and clear crescent region. As may be seen in
Fig. 7, the dorsal blastoporal Up appears always at the margin of vegetal
yolk nearest to the centre of the clear crescent. In some of these experiVeg.
FIG. 7. Schematic drawings of eggs of axolotl which have been partially turned, but
at different angles, around an axis perpendicular to symmetry. Left, before the experiment ; right, after the experiment. An. : Animal pole; Veg. vegetal pole ; bl. : dorsal lip of
the blastopore ; * : centre of the grey crescent ; dotted area : heavy yolk.
373
between vegetal yolk and clear crescent region. As may be seen in
Fig. 7, the dorsal blastoporal Up appears always at the margin of vegetal
yolk nearest to the centre of the clear crescent. In some of these experiVeg.
FIG. 7. Schematic drawings of eggs of axolotl which have been partially turned, but
at different angles, around an axis perpendicular to symmetry. Left, before the experiment ; right, after the experiment. An. : Animal pole; Veg. vegetal pole ; bl. : dorsal lip of
the blastopore ; * : centre of the grey crescent ; dotted area : heavy yolk.