268 



Mac Dougal, 



as terrestrials were placed in the water. Also cuttings including several 

 internodes were thrown into tanks in which they floated freely. The 

 rejuvenescence of these cuttings was characterized by the development 

 at first of two or three ovate, serrate leaves, which passed through 

 dissected stages into the filamentous types (Fig- 5). If small cuttings 

 were used the nepionic leaves were broadest, but were still not so broad 



Fig. 3. 



Fig.' 5. 



Fig. 4. 



Fig. 6. 



Fig. 3. 



Fig. 4. 



Fig. 5. 



Fig. 6. 



Mature leaf of Neoheckia of the terrestrial type. 

 Mature leaf of Neobeckia of the aquatic type. 

 Plantlet of Neobeckia from cutting floating freely in water. 

 Rejuvenation of small cutting of Neobeckia. 



as those of terrestrials in rejuvenescence {Fig. 6). The rejuvenescence 

 of lateral buds attached to stems of some length was characterized by 

 nepionic leaves which were still narrower, being oblong-linear, more or 

 less remotely serrate, and passed quickly into the finely dissected type 



(Fig- 9). 



In June 1912, a number of cuttings were made from the radish- 

 like underground members, which are probably a combinatioa of roots 



