THE THREE PHASES OF GROWTH. 



415 



In the ripe seed of the same plant we should find the embryo in the form //. 

 Between v and 7v is now intercalated a mass of tissue, which is elongating, and 

 which subsequently forms the hypocotyledonary segment (//) of the shoot. The first 

 leaves, or cotyledons, c c, have grown considerably. Of the embryonal tissue, of 



FIG. 254.— Diagram of the distribution of the 



1 pliascs of growth in a dicotyledo 



which the entire embryo formerly consisted, there now remain on!}- two portions, 

 separated from one another ; the upper one of these constitutes the growing-portion 

 of the future plumule, and the lower that of the radicle {zo). 



In /// we have represented the same plant as in //, after the conclusion of 



