338 Arber. — On the Nature of the 'Blade' in 
Figs. 13-16. Figs. 13A-F, Veratrum 1 album nigrum sections from a slightly oblique 
transverse series through a shoot apex, the three innermost (f x ,f 2 , and f 3 ) of the numerous leaves 
being alone represented ( x 14). Bundles of f 3 lettered m.b. (median bundle) and /. x , 1 . 2 , 1 . 3 , /'. x , 
r-» ?•* (lateral bundles). In Figs. 13 a, c, and d, the bundles of f. x are also lettered m.b’ . (median 
bundle), b. x , b. 2 , b. 3y b'. x , b'. 2 , b '. 3 (lateral bundles). Series ranges from Fig. 13 a, sheathing region of 
the three leaves, to Fig. 13 F, which passes through the solid apex of f 3 , and near the apex of f. x and 
/. 2 ; in Fig. 13 E there is a cavity ( cav .) in f. z , showing that the apex is hooded. Figs. 14 a-F, Smilax 
herbacea, L., Fig. 14 A, transverse section of apical bud (x 14); the sheathing base of leaf s. x 
encloses a second leaf, whose petiole, pet. 2 , showing ventral invagination, i is cut at the level of 
attachment of the tendrils, /. 2 and t '. 2 \ a third leaf is cut through the ‘lamina and the two free 
tendrils, t . 3 and t r 3 ; Fig. 14 b, transverse section of another leaf passing through the lamina, f, at more 
