OBJECT LESSONS IN BOTANY. 



189. As to the seed-kernel, 

 it may consist of two parts, 

 namely, the germ and albu- 

 men, or it may be all germ. 



190. In the Bean (Fig. 311) 

 it is all germ. A better name 

 for the germ is embryo. JSTow 

 in all seeds, the embryo is, in 

 fact, a miniature plant, consist- 

 ing of three parts, viz., radi- 

 cle, plumule, cotyledons. In 



Fig. 311. Seed of Beau, without ita 

 hell: c. care the two cotyledons; r, the 



this Bean, r is the radicle,^ radicle; /, the plumule, 

 is the pi in 



cotyledons. 



is the plumule, c. c, are the ^- 812 - Seed of Wheat, cut ope 



the albumen; c, the one cotyledon' 



plumule; r, radicle. 



317 



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



Fig. 314. Seed of Heather. Fig. 315. 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 beau 



