Scutellum in Zea Mats . 
123 
EXPLANATION OF FIGURES IN PLATE V. 
Drawn by Miss Robertson to illustrate the paper on the Scutellum of Zea Mai's by herself and 
Miss E. Sargant. 
. [Figs. 9, 19, 20, 21 are by Miss E. Sargant.] 
The following lettering is used throughout : — h.e., horny part of endosperm, f.e ., floury part of 
endosperm, sc., scutellum. ep., epithelium, vs., main vascular trunk of the upper scutellum. 
v.s r ., one of the vascular strands which ramify in the lower scutellum. cl., coleoptile. cr. f coleorhiza. 
R., radicle, pi., plumule, r'., r* ., ‘ wedging’ roots, etid., endodermis. 
PLATE V. 
Fig. 1. Diagram of the grain in radial longitudinal section, founded on the figure in Sachs’s 
Textbook. 
Fig. 2. Sketch of a seedling one day old. x 5. 
Fig. 3. Same seedling with fruit-coat and seed-coat removed, x 5. 
Fig. 4. Sketch of a seedling five days old. x 5. 
Fig. 5. Side view of the same seedling, x 5. 
Fig. 6. Radial longitudinal section of the same seedling, x 5. 
Fig. 7. Diagrammatic transverse section through seedling two days old, showing the position of 
the rudimentary ‘ wedging roots.’ 
Fig. 8. Diagrammatic transverse section through the same seedling, 1*3 mm. above the level 
of the last figure. 
Fig. 9. Sketch of seedling A 9 , six days old. Life size. 
Fig. 10. Part of seedling A 9 . Endosperm removed, root and shoot cut short. The dotted lines 
give level of sections drawn in Figs. 15 and 16. x 1. 
Fig. 11. From seedling A 9 . Trans, sec. of scutellum showing epithelium and a vertical 
gland, g v x 1 20. 
Fig. 12. From seedling A 9 . Trans, sec. of scutellum showing gland g 2 cut obliquely, x 120. 
Fig. 13. From embryo dissected from a dry seed and fixed in meth. sp. Trans, sec. of scutellum 
showing deep pit filled with secretion and prolonged into gland. x 137. 
Fig. 14. From seedling A 4 . Trans, sec. of scutellum showing epithelium and two deep vertical 
glands {g r ,g"). x 120. 
Fig. 15. From seedling A 9 . Main bundle of scutellum. x 137. 
Fig. 16. From seedling A 9 . Complete trans. sec. of scutellum. The main bundle is cut at 
a higher level than that drawn in Fig. 15 (see Fig. 10) ; its structure has become amphivasal, and it 
is giving off ramifications resembling transfusion tissue, x 33 circa. 
Fig. 17. From seedling A 9 . Part of section drawn in Fig. 16, enlarged to show the main 
bundle and its immediate ramifications, x 125. 
Fig. 18. From seedling A 4 . Amphivasal structure of main bundle and single ramification with 
its termination, x 125. 
Fig. 19. From seedling A' t (just germinated). Part of phloem from radial long. sec. x 240. 
s.s., probably young sieve-tubes. 
Fig. 20. From seedling A 9 (six days old). Phloem from branchlet cut longitudinally, alb. 
albuminoid cells, c.c ., central cells. 
Fig. 21. From seedling A 9 ; same section as above. Branchlet cut transversely : x., xylem : 
alb., albuminoid cells: c.c., central cells. 
