OBJECT LESSONS IN BOTANY. 



in the soil, while the bud has mounted hio^her, unfoldinf^ 

 itself into stem and leaves, and spreading itself in the air and 

 light. 



201. The yonng plant has now become independent of the 

 seed, which will soon wither and perish. The cotyledons, in 

 this case, are never able to throw off the shell, but perish 



A 



828 327 



Progress of germination in Maple.— i^^^. 323. A seed (samara). Fig. 324. The 

 same, just beginning to grow ; the rootlet descends, the cotyledons have burst the 

 shell. Fig. 325. The leaf-like cotyledons (c) nearly open, the stem (s) and root {r) 

 lengthening. Fig. 326. The terminal bud appears. Fig. 327. The first pair of true 

 leaves expanded. Fig. 328. The second pair appear, &c. 



together with it. In other plants, however, as in Maple 

 (Fig.- 325), the two cotyledons escape from the shell, change 

 color, and become leaves, — the first pair on the plant (<?). 

 202. The bud, which we called plumule, is still seen at the 



201. When does the seed perish? Cotyledons of Oak and Maple — how 

 differ in development V 



