PYRUS. 



Ill 



the ovciry 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 i)rotruded ; 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. 



Ge7ini?iatlo?i , Plant these seeds, or find in the garden 

 seeds already sprouted {germinatiiuj), and learn what the 

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

 cle, r, growing downward as the root, the pluimde, 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- 



