igig] DORETY—DIOON 257 



Fig. 6. — Germination of lower haK of seed. 



Fig. 7. — First scale leaves, side view. 



Fig. 8. — Cross-section of cotyledons and plumule, showing approximately 

 opposite arrangement of leaves. 



Fig. 9. — Seedling 2 months after germination. 



Figs. 10-12. — First, second, and third scales respectively. 



Fig. 13. — Size of vascular cylinder to relative root. 



Fig. 14. — Diagram showing cause of girdling of leaf traces and apparent 

 absence of stem tip. 



Fig. 15. — GirdUng of leaf traces lower down in stem ; vertical magnification 

 greater than horizontal. 



Fig. 16. — Diagram of hypocotyl cylinder or "plate." 



Fig. 17. — Section i mm. below fig. 16. 



Fig. 18. — Transition to root arrangement; separation of phloem masses of 

 4 poles. 



Fig. 19. — Vascular cylinder of root. 



Figs. 20-22, 24. — Cotyledonary variations. 



Figs. 23, 25. — Details of arrangement of epidermis over inner sides of 

 cotyledons and cotyledonary sheath. 



Fig. 26. — Exarch bundle from tip of cotyledon. 



Fig. 27. — Mesarch bundle from central part of cotyledon. 



Fig. 28. — Endarch bundle from base of cotyledon. 



