of the Endosperm during Germination. 
455 
Fig. 1 
Fig. 2 
Fig. 3 
Fig. 4. 
Fig. 5. 
Fig. 6. 
Fig. 7. 
Fig. 8. 
EXPLANATION OF PLATE V. 
Figures 1 — 10, Tamus communis. 
Seed of Tamus at the commencement of germination, the 
radicle has just pushed open the lid-like portion of the 
testa around the micropyle. m. micropyle; r. radicle. 
A slightly older stage than Fig. 1. The micropyle lid, m., 
seen from above. 
The embryo and seed in section as in fig. 2 shewing the testa 
composed of thick- walled cells ; the c lid ’ surmounted by 
the micropyle and the radially arranged endosperm cells. 
In the embryo the cotyledon (c.) embedded in the endo- 
sperm (<?.), the first leaf ( l .) covered by the cotyledonary 
sheath ( s .) and the extruded radicle (r.) are seen. t. testa. 
The line (c.) does not reach the cotyledon. 
A more advanced stage of germination. The first leaf ( l .) of 
the plumule has pushed aside the two lobes of the coty- 
ledonary sheath (s.) and commenced to grow upwards. 
The young seedling shewing the formation of the tuber ( T .) 
at the base of the first leaf ; the first leaf possesses a 
sharply incurved tip. 
A young epicotyledonary tuber full of starch seen in section, 
s. starch, e. endosperm, T. the base of the cotyledon. 
An adult seedling in its first year, shewing the seed, to which 
the large tuber (T.), with its adventitious roots, still 
remains attached, the long petiole and expanded lamina 
of the first leaf. The dotted line marks the level of the 
soil. 
A section of the endosperm near the centre of a germinating 
seed; the cells are here rounded and possess thick walls, 
which are well provided with connecting threads as at x. 
Various stages of the action of the ferment on the wall 
can be seen. As soon as an entrance into the wall has 
been effected along one or more of the threads the ferment 
proceeds to dissolve the wall, especially in the region of 
