PLATE II 
Tue Errecr or Light upon Earty DEVELOPMENT 
Fic. 1. The effect of light upon the development of Pinus ponderosa 
(S. D.). Ten plants each (1) grown in open light, (2) grown in medium 
shade. 5@ natural size. 
Fic. 2. The effect of light upon the development of Robinia pseudacacia. 
Three plants each (1) grown in open light, (2) in medium shade, (3) 1 
dense shade. 3% natural size. 
