SEEDLINGS. 



[SECTION a 



the cereal grains) it raises the comparatively light seed into the air, th,. 

 tip still remaining in the seed and feeding upon the albumen. "\Vlin\ 



this food is exhausted and the seedling is well cs 

 tablislied in the soil, the upper end decays and ihn 

 emptied husk of the seed falls a\\;i\. 



43. In Maize or In- 

 dian Corn (Fig. 60-70), 

 tliu cmbrvo is more dc- 



v 



veloped in the seed, and 

 its parts can be made out. 

 It lies against the starchy 

 albumen, but, is not 

 enclosed therein. The 

 larger part of it is the 

 cotyledon, thickish, its 

 edges involute, and its 

 back in contact \vith the 

 albumen ; partly enclosed 

 by it is the well-devel- 

 oped plumule or bud 

 which is to grow. For 

 the cotyledon remains in 

 the seed to fulfil its office 

 of imbibing nourishment 

 from the softened albu- 

 men, which it convey to 

 the growing sprout ; the 



part of this sprout which is visible is the first leaf of the plumule rolled up 

 into a sheath and enclosing the rudiments of the succeeding leaves, at the 

 base enclosing even the minute caulicle. In germination the first leaf of 

 the plumule develops only as a sort of sheath, protecting the tender parts 

 within; the second and the third form the first foliage. The cauliele m \er 

 lengthens: the first root, which is formed at its lower end, or from any 

 part of it, has to break through the enclosing sheath ; and succeeding roots 

 soon spring from all or any of the nodes of the plumule. 



II Simple-stemmed Plants are thus built up, by the continuous pro- 

 duction of one Leaf-bearing portion of stem from the summit of the preced- 

 ing one, beginning \\ilh the initial stem (or caulicle) in the embryo. Spine 

 I)ic>.il\ls ami many Mmioeotvls develop only in this single line of growth (as 

 to parts above ground) until the flowering stale is approached. For some 

 examples, see ( 'yeas (Fig. 71, front, at the left); a tall Yucca or Spanish 

 I'.ayouel, and two Cocoa-nut Palms behind; at the right, a group of Sugar- 

 canes, and a Banana behind. 



Fu;. 71. 



reputation. 



