9 



1 





with the cotyledon and shows a distinct sheath and blade, 

 the form of which is cordate^ sometimes ovate or even round- 

 ish in other specimens, while the final and normal form of 

 the leaf is oblong-cordate (Fig. 164). 



If we were now to follow the further development of the 

 germinating plantlet, we would see that the primary root 

 continues its growth without showing any tendency to ramifi- 

 cation, and further, in Fig. 160, that the first internode has 

 been formed and directed vertically. In this same state two 



more leaves have come out (L^ and L^), and there is also 



seen the beginning of the development of the fourth one (L^). 

 Two secondary roots have appeared, the first one (r^) just 

 above the primary root and at the very base of the leaf (L^), 

 while the other one has been dev^eloped on the middle of the 

 first internode and in alternation with the root (r^). There 

 was from the very young state (Fig. 157), to the last men- 

 tioned one (Fig. 160), a period of two months. A few days 

 after the primary root had attained its final length, and the 

 ,-< germinating plantlet (Fig. 161) had stretched itself and 



obtained one more internode besides one more leaf (L^j, while 

 the secondary root (r^) has not yet grown out in this specimen ; 

 but we see, on the other hand, that the primary root of this 

 specimen has obtained a lateral branch, a case, however, 

 which seems to be relatively rare in the specimens examined. 

 The further growth of the plant is already indicated, the 

 stem being; erect, consisting^ of several internodes of about the 



^ V-*V,^U, X,V^..v^Xv,.,..XJ^ 



same length, and all provided with roots, one at each inter- 

 node, and developed opposite the respective leaves. This is 

 seen in Fig. 162, where a young plant has been drawn five 

 months later than the last-mentioned one (Fig. 161). We 

 see here that the seed is still attached, that the primary root 

 still persists without fading, and that a number of secondary 

 roots have been developed from the stem. The oldest of 

 these secondary roots (r^) has not attained any consider- 

 able length, and does not grow any more. The same seems 

 to be the case in regard to r^ while all the other ones (rW^) 

 are growing quite rapidly, and all directed downwards to the 

 ground, offering in that manner a good support to the ascend- 



