PLATE 1 
A. —Orange trees in sand cultures which had received .25 C nutrient solution. 
B. —Orange trees in sand cultures which had received .50 C nutrient solution. 
C. —Orange trees in sand cultures which had received 2.0 C nutrient solution. 
D. —The root systems of orange trees from sand cultures: No. 93 received 
.25 C solution; No. 99 received .50 C solution; and No. 110 received 2.0 C solution. 
