‚JOHNSON. — Nuclear Division. 
PLATE I. 
Fig. 14. Piece of the serosa from an advanced embryo, with four adjacent tri- 
nucleate cells (1, 2, 3,4); nuclei of cell a and the large cell farthest 
to left have undergone degeneration. X 90. 
Fig. 15. Three cells of the serosa from an old embryo to show recession of daugh- 
ter nuclei towards the ends of the cells. X 90. 
Figs. 16-20 are from the amnion. 
Figs. 16-19. Stages in the division of amniotic nuclei. In Figure 18 three stages 
are shown, a, b,c. X 800. 
Fig. 20. Two amniotic cells, apparently formed by recent division. X 875. 
Figs. 21-26 are from the capsular epithelium. 
Figs. 21-23, Cells showing successive stages of nuclear division. 800. 
Figs. 24-26, Cells to show the degeneration of nuclei. In Figure 24 the nuclei 
a.e but slightly differentiated; in Figure 25 the pale nucleus has 
become much larger and very faint; in Figure 26 it has disappeared 
altogether. X 800. 
