106 PRACTICAL BOTANY. 



body of the embryo itself. Note (a) the central attach- 

 ment of the scutellum to the body of the embryo ; (fy 

 the vascular bundles, which form a connection through 

 it ; (c) the Epithelium of peculiar structure, which 

 faces the endosperm. 



The body of the embryo consists of 



a. An Apical bud, with several sheathing leaves, 

 which surround the apical cone. 



b. A Radicle, having similar arrangement of the 

 meristem to that of the older root (cf. infra.). Outside 

 the radicle, and continuous with the root-cap, is a 

 root-sheath or Coleorhiza, the existence of which 

 shows the endogenous origin of the radicle. 



III. Cut sections of the endosperm, and treat with 

 solution of iodine. Note the polygonal starch grains 

 (blue), and the protoplasmic matrix (brown). 



Germination. I. Compare plants which have been 

 germinated for different periods : the following facts in 

 the history of germination may be observed : 



1. The fruit swells. 



2. The outer coat ruptures opposite the apex of the 

 radicle, which soon protrudes aod bursts through the 

 coleorhiza also, which appears as an irregular ring 

 round the young root. 



3. The rupture of the coat extends upwards to the 

 point opposite the apical bud, which also emerges. 



4. The root elongates, and forms lateral roots : other 

 lateral roots (usually two) appear above the insertion of 

 the scutellum : these soon equal the primary root in 

 length. Hence there is no well marked tap root. 



5. Leaves of the plumule unfold, and gradually turn 

 green. 



