L£!>ilOyS WITH PLASTS 



stalk is callod, in all seeds, the funiculus. When 

 the funiculus breaks away from the seed, it 



leaves a scar (D, 

 Fig. 350) . This scar 

 is the hilum. 



408. If we split 

 the bean length- 

 wise (preferably 

 after it has been 

 soaked in water 

 for a few hours), 

 we find that the 

 seed is composed of 

 two thick cotyledons; 

 and these are the 

 parts which are 

 afterwards elevated 

 into the air (a, Fig. 348). One-half of a bean 

 (that is, one cotyledon) is shown in Fig. 3.50. The 

 other cotyledon was attached at C. The plumule 

 is at S, and the incipient stem, or eaulicle, at 

 O. All these pai-ts — cotyledons, eaulicle, plumule, 

 — constitute the embryo. 



408a. Over the point of the eaulicle, the close observer will 

 find ~ a minute depression and a hole leading into the bean. This 

 is the micropyle, and is the point at which the pollen-tube en- 

 tered, and the place through which the root breaks in germination. 

 In the eoeoa-nut the positions of the three micropyles are shown 

 by the sears (Fig. 3.ol) but since only one of the loeules develops a 

 seed (332a), germination takes place through only one scar. 



l''](i. :iol. 

 Micropylar sears of cocoa-nut. 



