PLATE IV 
Tue Errect oF Soil Moisture uPoON Earty DEVELOPMENT 
Fic. 1. The effect of soil moisture upon the deve'opment of Pinus pon- 
derosa (S. D.). Ten plants grown in (1) medium dry soil, (2) wet soil. 
Y% natural size. 
Fic. 2. The effect of soil moisture upon the development of Robinia 
pseudacacia. Three plants grown (1) in wet soil, (2) in medium dry soil. 
Y% natural size. 
