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Lyon: OBSERVATIONS ON EMBRYOGENY OF NELUMBO. 655 
18. Shows a sectional view of the base of an embryo in stage C. 
(x 190). 
19. Shows the plumule of a young embryo in stage D in longitudi- 
nal section (X50). @=apexof stem. 6=first leaf. c=second leaf. 
e=endosperm. s, =stipule of first leaf. s, =stipule of second leaf. 
20. Vertical section through apex of cotyledonary lobes showing 
differentiation of a nursing area (x 50). 
21. A portion of the same under a higher magnification showing 
the densely protoplasmic palisade tissue of the nursing area. 
Prann ele: 
22. Longitudinal section of the plumule of the seed (x15). The 
first and second foliage leaves are cut off, their basal portions only 
showing in the figure. r=radicle. 
23. The apical bud in the same section (x50) showing the third 
and fourth foliage leaves enclosed by the stipules of the first and 
second. @=apex of stem. s,=stipule of first leaf. s,=stipule of 
second leaf. 
24. Longitudinal section of the hypocotyl of a seedling showing the 
vestigial radicle (x 50). 
25. Cross section through the epicotyl of a young seedling showing 
the adventitious roots, the first to function, (x 50). 
