474 



iso'tANf. 



part such that the veins rarely are parallel to each other, and 

 in their anastomosing they form an irregular net-work. 



The germination of Dicotyledons may be illustrated by a couple of 

 examples. In tlie seed of tbe Windsor Bean (Fig. 367) the embryo 

 entirely fills up the seed-cavity, the endosperm having all been nb- 



Fiea. 887-8.— Germination op Dicotyledons. 



Fio. 36S. 



Fig. 367. — Yiciafdba. ^, seed with one cotyledon removed; c, remaining cotyle- 

 don ; hn, the plumule ■, w, the radicle ; s, seed-coat. S, germinating B^ed ; s, seed- 

 coat, partly torn away at I; n, the hilum ; st, petiole of one of the cotyiedone; A, 

 curved epicotyledonary stem ; he, short hypocotyledonary stem ; A, main root ; W8, 

 its apex ; hn, hud in the axil of one of the cotyledons. — After Sachp. 



Fig. ^&&.—Ricmu8 communis, /., longitudinal section of the ripe seed. II., ger- 

 minating seed with the cotyledons still mside of the eeed-coat (shown more distinct- 

 ly in A and B). 8, seed-coat ; e, endosperm ; c, cotyledon ; he, hypocotyledonary 

 stem ; w, primary root ; «/, branches of root ; x, canincle, a peculiar appendage to 

 the seeds of EuphorbiacecR. — After Sachs. 



sorbed. The thick cotyledons lie face to face, and are attached belcw 

 to the small stem of the embryo plant. The stem extends upward a 

 short distance between the cotyledons, bearing a few rudimentary 

 leaves and itself ending in a punetum mgetationis (Fig. 369, as), the 

 whole constituting the plumule. The downward prolongation of the 

 stem (commonly but erroneously called the radicle, for it is not a little 



