ae ‘THE BEHAVIOUR OF PLANTS 
22, the dark with those grown in the light 
aati there is another striking difference be- 
\" tween them which we cannot fail to 
observe. The stems grown in the dark 
are longer, but they are less firm, and 
they are not capable of supporting them- 
selves so well as the stems grown in the 
light. This is well shown even in the 
week-old seedlings of the buckwheat, as 
seen in Fig. 166. They cannot support 
their own weight, but 
fall over and hang 
down by the side of the 
pot. This is marked 
also in Fig. 169, which 
is a later stage of the 
marrow _ seedling 
shown in Fig. 164. It 
(i D is now three weeks old, 
eles v4 and has grown all this 
mn ane ? time in the dark. To 
“sigma == support the stems they 
a ‘wll iE were tied to a stake. 
\! Hy HH . 
nes , \ A Those grown in the 
rr] ‘ MB 
. Osea: t ty 
SOT y light are stouter and 
Fig. 167. Sunflower F1G. 168. Sunflower seed- firmer and are able to 
seedling grown in lings grown in dark, older 
fark. (Nat. size.) than in Fig.167. Reduced.) Sttpport themselves. If 

