MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



195 



Buds were formed on the calluses over cut surfaces in a few of 

 these small plants, and these, together with some of the awakening 

 dormant buds, made a growth of a centimeter or less, then went into 

 a resting condition being loosely covered with silky-hairy brown 

 scales (see Fig. 152). 



The above observations are fairly in accord with those made by 

 Jost ^^^ upon Fagus sylvatica (?). Jost found that darkness hindered 

 the development of beech buds, and that when a few buds were 

 exposed to the light by the extrusion of a branch from the dark 

 room, the others in darkness showed greater activity than the buds 

 of plants wholly confined in darkness. The first crop of buds 

 developed in darkness were but 3 cm. in length, and a second series 

 awakening later made a growth of 

 about 8 cm., bearing leaves about 

 5 cm. long. Jost believed to have 

 demonstrated by his series of " par- 

 tial etiolations " that some substance 

 formed in light is necessary to the 

 growth of buds of the beech. 



The larger trees used in my 

 own experiments were trimmed by 

 having a few of the larger branches 

 cut away, and the only growth 

 shown by such trees consisted in the 

 formation of buds and branches 

 from the calluses formed over the 

 wounds. The buds in some instances 

 did not elongate more than a centi- 

 meter before going into a resting 



condition, while in others branches 18 to 20 cm. long were formed, 

 .consisting of 5 or 6 internodes, of a length of 2 to 5 cm. and bore 

 leaves which fell away after attaining a length of about 5 cm. The 

 stems and leaves were silky with appressed hairs. Numerous lenti- 

 cels were formed. 



Normal stems of trees in the open air made a growth of 6 to 11 

 cm. in the season of 1902, and about 5 or 6 internodes were formed 

 with lengths varying from 2 to 42 mm. The internodes of the 



"8 Jost, L. Ueber den Einfluss des Lichtes auf das Knospentreiben der Roth- 

 buche. Ber. d. Deut. Bot. Ges. 12 : 188. 1894. 



Fig. 151. Fagus sylvatica. A, nor- 

 mal leaf. ^, etiolated leaf. Drawn 

 to scale. 



