1912J JONES— DIANTH ERA 29 



Fig. 11. — Sagittal section of a seed; X 12. 5. 



Fig. 12. — Longitudinal section of a seed, made perpendicular to the plane 

 of the section shown in fig. 11, and through the line mn; X 12. 5. 



plate 11 



Fig. 13 — 



hyp 



seed, just below the insertion of the cotyledons; X 185. 



hyp 



Fig. 14. — Transverse section through the middle portion of the same 



the stele; X185. 



Fig. 15. — Habit sketch of a seedling; stage I, with cotyledons still inclosed 

 within the testa; X1.5. 



Fig. 16. — Transverse section of the upper portion of a first-stage seedling, 

 just below the insertion of the cotyledons, showing the two "double" cotyle- 

 donary traces; X185. 



Fig. 17. — Diagram of the paths of the bundles in a seedling, stage I. 



Fig. 18. — Diagram of the paths of the bundles in a seedling, early phase 

 of stage II. 



Fig. 19. — Habit sketch of a seedling, stage II (late phase); Xi. 



Fig. 20. — Diagram of the paths of the bundles in a seedling, late phase of 

 stage II. 



Fig. 21. — Diagram of the paths of the bundles in a seedling, early phase of 

 stage III. 



Fig. 22.— Habit sketch of a seedling, stage III; X 1. 



Fig. 23. — Transverse section of one of the side bundles in the basal epi- 

 cotylar internode of a third-stage seedling, showing its "double" appearance, 

 the three protoxylem, and three protophloem elements; X380. 



Fig. 24. — Transverse section of the same bundle as shown in fig. 23, at a 

 lower level, just at the top of the fork; X380. 



Fig. 25. — Transverse section of the same bundle still lower down, the 

 forking complete; X380. 



Fig. 26.— Surface view of a glandular hair; X380. 



Fig. 27.— Longitudinal section of a glandular hair and neighboring 

 epidermis; X380. 



Fig. 28. 



uppermost 



seedling, showing the two procambial bundles of the traces of the uppermost 

 Pair of leaves imbedded in the ground meristem; X380. 



Fig. 29.— Diagram of the paths of the peripheral bundles in a seventeenth- 

 stage seedling (near end of growing season), showing the gradual development 



typ 



PLATE III 



Fig. 30.— Restoration of the vascular system of a node of a fourth-stage 

 seedling, showing the courses and attachments of the intranodal medullary 

 Phloem strands. 



