MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



191 



AEsculus Hippocastanum L. 



Seeds of the horse chestnut placed in the soil germinated in the 

 control chamber, and in the dark room in the following May. Nor- 

 mal seedlings sent up a stem in which only the basal internode de- 

 veloped a length of about 11 cm. and a diameter of about 9 mm. 

 at the base tapering to 4 mm. at the summit. The normal seedling 

 with a shoot consisting of a single internode on July 22, bore a 

 single pair of quinate leaves and a strong terminal bud. The normal 

 internode was somewhat angular in outline and of a deep green 

 color. (See Fig. 149.) 



On July 22 the single etiolated seedling on hand had developed a 

 stem 50 cm. in length consisting of ten internodes, the terminal one 



Fig. 149. AEsctchis Hifpocastanum. Normal seedling. 



of which had made about half of its probable ultimate growth. The 

 basal internode was 12 cm. in length, and with a diameter of 7 mm., 

 thus exceeding the normal slightly, both in length and thickness. 

 This, as well as the other etiolated internodes, was compressed in the 

 plane of the opposite leaves. The leaves were represented by pairs 

 of sessile bracts with broad clasping bases and ciliate margins wholly 

 unlike the foliar organs developed on the seedling. It is to be 



