206 BOTANICAL GAZETTE [OcTOBER 
as a means to secure as great a rate of growth for the plants, espe- 
cially for the aerial portion, as was obtained by the plants started 
with relatively small roots having less surface exposed for absorption 
TABLE I 
EFFECT ON DRY MATTER PRODUCTION OF DIFFERENT ROOT SYSTEMS OF WHEAT 
SEEDLINGS GROWN IN DIFFERENT NUTRIENT SOLUTIONS (WEIGHT IN GM.) 
Crass A ss B 
Cultures having large root systems when placed in Cultures having small root systems when 
solution placed in solution 
Tops | Roots | Total ‘Tops | Roots Total 
SOLUTION I 
1.22 0.42 1.64 3.00 °.73 3-73 
1.13 0.37 1.50 3.29 1.09 4.38 
1.35 0.40 575 2.60 0.53 3-13 
1.06 0.38 1.44 3.12 0.95 4.07 
1.38 0.48 1.86 2.95 0.70 3-65 
1.07 0.35 1.42 3.04 0.67 3-71 
1.41 0.55 1.96 3.02 0.62 3.64 
irs °.40 YUSs 2.07 o.60 3-57 
AVEPage......5 5: 1.26 0.42 1.64 3.00 0.74 3-74 
SOLUTION 2 
1.65 0.43 2.08 0.62 0.12 -84 
1.42 0.35 197 °.60 0.10 90.79 
I.00 0.36 1.36 0.45 0.10 0.55 
I 0.37 1.86 o.61 0.12 0.73 
1.38 0.36 1.74 0.75 0.11 .86 
1.10 0.39 1.49 G.55 ° 0.64 
1.32 0.37 1.69 0.53 0.10 0.63 
1.10 0.39 1.49 
AVEIape: .o 5.5. 1.30 0.38 1.68 0.59 0.11 0.70 
SOLUTION 3 
I 0.39 1.39 2.94 0.35 3-329 
0.98 0.35 =. 43 2.96 0.35 3-31 
1.24 0.42 1.66 3.00 0.46 3.46 
1.61 0.48 2.09 2.40 0.27 2.67 
1.00 0.33 5B 2.97 0.42 3-39 
1.07 0.30 1.87 *1.62 0.21 1.83 
1.05 0.30 1.35 2.50 0.32 2.82 
£75 0.37 2.12 2.74 °.39 3-13 
Average. 2... 5.5 ¥.21 0.37 1.58 2.64 0.35 2.99 
* Two plants in this culture died. 
processes. On the other hand, it is not evident that the large root 
systems prevented the cultures of class A from attaining to the 
