496 MISS ISABEL MCCLATCHIE ON 
with the ground. This angle varies in size, so that the hypocotyl may 
occupy any position between the vertical and the horizontal. 
zh 
Ето. 2.—Longitudinal section of a Fre, 3.—Upright plant showing ad- 
young adventitious root emerg- ventitious roots near the ground 
ing from the stem. At the base level and the unusual develop- 
of the root is a rim formed by the ment of roots from the base of the 
ruptured cortex. first epicotyledonary internode. 
—— 
Fie, 4 a.—Adventitious roots developing from the lower side of the swollen base of a robust 
lateral branch. Note the typical change in the diameter about one-third dist 
from the tip. 
ant 
One large group of plants which grew on the north side of a high wall 
running almost due east to west, and which consequently never received the 
