91 



OBJECT LESSONS IN BOTANY. 



189. As to the seed-kernel, 

 it may consist of two parts, 

 namely, the germ and albu- 

 meii, or it may be all germ. 



190. In the Bean (Fig. 311) 

 it is all germ. A better name 

 for the germ is emhrijo, Kow 

 in all seeds, the embryo is, in 

 fact, a miniature plant, consist- 

 ing of three parts, viz., radi- 



/>7zj rrn,^,n^^n ^ ,^v. 1 J T ■^^9- ^H- Seed of Beau, without its 



cLe, plumule,^ cotyledons. In ,1,^11 : c, c are the two cotyledons ; ., the 



this Bean, r is the radicle, j) radicle; p, the plumule. 



is the plumule, C, C, are the ^'^•■■'^^- Seed of wheat, cut open : a is 

 -IT the albumen; c, the one cotvledon ; j>, 



cotyledons. ph.mule; r, radicle. 



Fig. 313. Seed of Four- o'clock ; embryo two-cotyledoned, coiled; a, albumen. 



Fig. 314. Seed of Heather. Fig. 815. A section of the same, showing the curved 

 embryo, with two cotyledons, lying in albumen. 



Fig. 316. Seed of Onion. Fig. 317. Section of the same, showing the coiled em- 

 bryo, one cotyledon, in albumen. 



191. The radicle is the part destined to grow downwards 



189. Of what two parts may the seed-kernel consist ? 



190. Describe the parts of the seed of bean. 



