ILLUSTRATIONS 
Fig. 1. Diagram for series I, showing culture numbers and osmotic pro- 
portions of the four salts. Also, showing the relative dry weights 
of wheat tops; area of low yields (60-77), denoted by small 
circles; area of high yields (100-87), denoted by small crosses; 
culture giving lowest yield is marked by a large circle, that 
giving highest is indicated by a large cross. 
2. Diagram for series I, showing leaf injury; cultures marked by 
crosses showed severe injury; those marked by circles showed 
slight injury. 
3. Diagram for series I, showing relative dry weights of wheat roots; 
area of low yields (56-69), marked by small circles; area of 
high yields (100-80), marked by small crosses; culture giving 
highest yield is marked by a large cross, that giving lowest yield 
is indicated by a large circle. 
4. Diagram for series II, showing culture numbers and osmotic pro- 
portions of the four salts. Also, showing relative dry weights 
of wheat tops; area of low yields (69-77), marked by small 
circles; area of high yields (100—92), marked by small crosses; 
culture giving lowest yield is marked by a large circle, that 
giving highest is indicated by a large cross. 
5. Diagram for series II, showing leaf injury; cultures marked by 
crosses showed severe injury; those marked by circles showed 
slight injury. 
6. Diagram for series II, showing relative dry weights of wheat roots; 
area of low yields (56-69), marked by small circles; area of 
high yields (100-80), marked by small crosses; culture giving 
lowest yield is marked by a large circle, that giving highest yield 
is indicated by a large cross. 
7. Diagram for series III, showing culture numbers and osmotic pro- 
portions of the four salts. Also, dry weights of tops; high yields 
marked by triangles; low yields marked by squares. 
8. Diagram for series III, showing leaf injury; cultures marked by 
triangles showed severe injury; those marked by squares showed 
slight injury. 
9. Diagram for series III, showing dry yields of roots; high yields 
marked by triangles, low yields marked by squares. 
10. Graphs of average actual yields (grams) of wheat tops for series 
IV. Also, average actual yields (grams) of wheat roots for 
series IV. 
11. Graphs of average total amounts of water absorption (cc.) for 
series IV. 
12. Graphs of average water requirement of tops and of roots, for 
series IV. 
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