BEHAVIOUR OF PLANTS TOWARD LIGHT 137 
record of the observations. Dothestems grow more rap- 
idly in the light or in the dark? Com- 
pare the leaves on the plants grown in 
the dark with those grown in the 
light. Compare the leaves of the 
wheat grown in the dark with those 
grown In the light. How does the 
wheat differ from the marrow, sun- 





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flower, or similar plant in this respect ? 
Fig. 164, left-hand plant, shows a 
marrow seedling grown in the dark. : , = 
The nght-hand plant in. the Same 44, ,.6 
figure is another of the same age lis grown in light. 
grown in the light. The stem grown in the dark. is 
} much longer than the one grown in 
the hght. These plants are about one 
week old. Fig. 166 represents seed- 
lings of buckwheat grown in the dark ; 
they are longer than 


those of the same 
age grown in the 
heht. 
Are the stems 
crown Ano dent 
stouter and firmer ? 
In comparing the 
Fic. 166. Buckwheat seedlings of same age, 
grown in dark, 
seedlings grown in 
