Lyon : OBSERVATIONS ox EMBRYOGENY OF NELUMBO. 655 



1 8. 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 ( X 50). a = apex of stem. =first leaf. c= second leaf. 

 c= endosperm. s l =stipule of first leaf. s 2 = 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. 



PLATE L. 



22. Longitudinal section of the plumule of the seed (XI5). 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 ( X 50) showing the third 

 and fourth foliage leaves enclosed by the stipules of the first and 

 second. #=apex of stem. ^=stipule of first leaf. ^ 2 =stipule of 

 second leaf. 



24. Longitudinal section of the hypocotyl of a seedling showing the 

 vestigial radicle (X5o). 



25. Cross section through the epicotyl of a young seedling showing 

 the adventitious roots, the first to function, ( x 50) . 



