Pad 2 xcer 
Figure 98.—Three-celled proembryo of /tuppia_ rostellata, showing 
basal suspensor-cell and two smaller embryo-cells. After Mur- 
beck. >< 446. 
Figure 99.—Nine-celled embryo of Ruppia rostellata, showing basal 
suspensor-cell and eight small embryo-cells. After Wille. >< 340. 
Figure 100.—Thirteen-celled embryo, showing division into three 
transverse segments of four cells each, and a large suspensor- 
cell with nucleus and cytoplasm in the characteristic position. 
>< S00) 
Figure 101.—Longitudinal section through older embryo, the heavy 
lines marking the outlines of the cells shown in figure 100. 
>< 800. 
Figure 102.—Longitudinal section of older embryo, showing the 
outlines of the original segments and the beginning of the 
formation of dermatogen, at least in the terminal segment, at 
left. >< 800. 
Figure 103.—Longitudinal section of embryo with a diameter of 
about 0.05 mm.; showing rather irregular segment lines, and 
globular form of embryo. >< 800. 
Figure 104.—Longitudinal section of embryo of a diameter of about 
0.075 mm.; showing increase in size of all cells, but only a 
shghtly greater number than in figure 103. >< 800. 
Figure 105.—Longitudinal section of embryo measuring about 
0.085 mm. in length; showing commencement of elongation, 
and divisions in the terminal segment, at the left, indicating 
approach of cotyledonary development. >< 300. 
Figure 106.—Longitudinal section of embryo measuring about 
0.135 mm. in length; segment limits obscure; apparently the 
terminal segment is commencing the formation of stem as well 
as cotyledon. Basal portion shows cells which go to form the 
rudimentary primary root. >< 375. 
