PYRUS. 



Ill 



the ovary and the calyx tube. In each of the 5 cells are 2 

 seeds, each large enough for an easy analysis (4). The 

 brown testa outside is readily separated from the soft, 

 white inner coat (tegmen). The cut (7) shows the naked 

 embryo, with its radicle and two cotyledons ; (5) and (6) are 

 sections. 



10, germination of the Beech-nut : 10, cross-section showing the 2 folded cotyle- 

 dons ; 11, the radicle only protruded ; 12, the ascending axis above c appears ; 13, 

 the cotyledons expand into a pair of leaves the first two, and show the plumule ; 14, 

 with rootlets and the first leaves from the plumule. 



Germination. Plant these seeds, or find in the garden 

 seeds already sprouted (germinating), and learn what the 

 several parts become in the plant. Here is seen the radi- 

 cle, r, growing downward as the root, the plumule, p, grow- 

 ing upward as the stem, and the 2 cotyledons appearing and 

 acting as the first leaves. The store of food laid up in them 

 is serving (like the albumen where there is any) for the nour- 



