Bui. 279, Bureau of Plant Industry, U. S. Dept. of Agriculture. 



Plate II. 



Fig. 1.— General Appearance of Cotton Plants 30 Days After Germination in 

 Bed A. Shades as Numbered; 1 Indicates Least Illumination and 6 Normal 

 Light. 



■ ■ r 

 ft* 



1/ ' 





Fig. 2.— General Appearance of Cotton Plant 30 Days After Germination in 

 Bed B. Shades as Numbered; 1 Indicates Least Illumination and 6 Normal 

 Light. 



Fig. 3.— Relative Growth of Mustard Plants at the End of 24 Days in Beds 

 A and B. Shades as Numbered, Ranging from 2 (n/1 5 Light.) to 6 (Normal). 



