Hill. — Studies in Seed Germination. 
427 
Text-figs. 10-T5. C. persicum. 10. A first plumular leaf put in as a cutting Nov. 6, 1918, 
which developed a callus and also roots — the drawing was made March 21, 1919. The cutting died 
nearly a year later. 11. A seedling in which the second cotyledon, c. 2, has been produced on 
removal of the first cotyledon (scar, c. 1 ). The lamina has been removed, and flange-like laminae, 
/. 2, have developed from the edges of the groove on the adaxial surface of the petiole. The first 
plumular leaf,/. 1, has grown up. 12. One of the flange laminae of the second cotyledon in side 
view. 13. A second cotyledon struck as a ‘ cutting’. As with the first cotyledon, there is no swelling 
at the base of the petiole. 14. An adventitious leaf developed from a decapitated seedling tuber 
(see PL XX, Fig. 4, and Text-fig. 15) struck as a cutting. The roots are formed as in the cotyledon 
cuttings, and there is no swelling at the base of the petiole. 15. A tuber of a see ' ling Cyclamen from 
which the upper portion has been removed, showing one fully developed adventitious leaf and others 
as marginal protuberances. The lamina of the leaf was removed, and a new lamina, /. 2, has developed 
from the surface of the petiole exactly as occurs when the lamina of a cotyledon is removed. 
