THE FLOWERING PLANT. 97 



PLATE XXIII. 



THE FLOWERING PLANT. EXTERNAL CHARACTERS. THE VEGETATIVE Axis. 



Unless otherwise stated, all the figures on Plates XXIII. and XXIV. illustrate the 

 structure of the French Bean plant, Phaseolus vulgaris. 



FIG. I. The entire seed, viewed from its attached surface, after a few hours' immersion 

 in water. 



FIG. II. The same, after removal of the testa. 



FIG. III. The same, after removal of the right cotyledon. 

 Seen from within. 



FIG. IV. A similar seed during germination, just on leaving the soil. 

 Grown in damp sawdust, the surface level of which is indicated hy the line i ii. 



(Figs. I. to IV. all nat. size.) 



FIG. V. A twelve-days' plant, grown as for Fig. IV. 

 The unlettered transverse line represents the surface level of the sawdust. 

 The arrows indicate the direction of growth of the original main axis. 

 The cotyledons, colourless in Fig. IV., were here quite green. \ nat. size. 



FIG. VI. Median longitudinal section through the embryonic axis of Fig. III. 

 The arrows indicate the direction in development of the procambium of oue lateral axis, 

 differentiation having commenced at the point marked by the adjacent line. 



Picric acid and alcohol. Eosin stained, preserved in Canada balsam. A. 2. 



FIG. VII. A portion of the hypocotyledonary axis of the above. D. 3. 

 The several tissues figured, graduate into each other as the apex is reached. 



FIG. VIII. Section of a cotyledon of the above. F. 2. Fresh, stained cosin. 



It is important to guard against mistaking cut corners of ceUs for intercellular spaces. 



FIG. IX. The apical cone of Fig. V. teased out with needles. 



The internodes are shaded darkly. D. 3. 



The apex of Anacliaris may profitably be teased up for comparison. 



FIG. X. Transverse section across the main root of Fig. V. Nat. size. 



13 



