18 



MORPHOLOGY 



latter are practically the earliest efficient foliage of the plantlet. 

 Thus, as in the germinating Cheny-seed (Fig. 30) , three or four 

 internodes of stem, with their leaves, ma}^ be produced before 

 these leaves themselves are sufficiently developed to make any 

 sensible contribution to this growth. And in the Beech and Bean, 



the leaves of the plumule come forward almost before the root 

 has attached the plantlet to the soil. (Fig. 32, 35.) Between 

 such cases and that of Maple and the like there are all degrees. 

 There are also familiar cases in which the storage of nourishment 

 in the cotyledons is carried to a maximum, with results which 

 gravely affect the development. 



FIG. 34. The embryo (the whole kernel) of the Bean. 35. Same early in germi- 

 nation ; the thick cotyledons expanding and showing the plumule. 36. Same, more 

 advanced in germination ; the plumule developed into an internode of stem bearing a 

 pair of leaves. 



FIG. 37. Embryo of Pea, i. e. a pea minus the seed-coat. 38. Advanced germi- 

 natior of the same. 



