THE ROOT-SYSTEM OF IMPATIENS ROYLEI. 505 
At the cotyledonary node roots were produced, in six plants all round the 
stem. In one plant there was only a slight root-development on the wall 
side, and in four plants roots were totally absent on that side. At the 
higher nodes there was a similar tendency to produce roots only from 
the side of the plant away from the wall, and the nodes from which the. 
roots were given off were, as a rule, considerably swollen on that side. 
There were also many roots developed from the hypocotyl and the first, 
the second, and (in four eases) the third internode. Where the stem was 
upright the internodal roots developed only from the side of the stem away 
Soil level 
—C.n.. 
Ете. 13. —Plant buried approximately vertically in the soil, showing resulting root- 
development. c.n., cotyledonary node; b., withered branch. 
from the wall,but in eases where the stem was bent the roots developed 
from the convex side only, whatever direction this caused them to take 
(text-fig. 13). 
These roots growing from the internodes did not, as in normal specimens, 
decrease in number from below upwards. In several instances they were 
