i7, 6 Trelease: Salt Requirements of Wheat Plants 585 
Dry weights . — The actual dry weights of tops and of roots 
for this series are given in Table 15, the weights of the plants 
in each of the duplicate cultures and the average weights being 
shown. The data given in this table have been plotted as 
graphs in fig. 10. In these graphs abscissas represent concen- 
tration, in terms of osmotic pressure in atmospheres, and ordi- 
nates represent yields in grams. The heavy line is the graph 
for the T2R4C2 cultures, the light line for the T1R1C1 cultures, 
the dotted line for the T7R1C1 cultures, and the broken line for 
the R5C2i cultures. 
Table 15 . — Dry weights of tops and roots of wheat; for series IV, conducted 
from January 23 to February 2U, 1917. 
Culture No. 
Osmotic 
Tops (6 plants). 
Roots (6 plants) . 
t ration. 
A. 
B. 
Average. 
A. 
B. 
Average. 
Atm. 
g- 
g. 
g . 
g. 
0 ■ 
0 . 
7.0 
0.675 
0. 582 
0.629 
0.210 
0. 240 
0. 225 
5.5 
0.728 
0.696 
0.712 
0. 280 
0.271 
0.276 
1.5 
0. 788 
0. 750 
0. 769 
0. 305 
0.301 
0. 803 
T7R1C1 
3.5 
0.769 
0. 760 
0. 765 
0.297 
0.266 
0.282 
2.5 
0.767 
0.699 
0. 733 
0.271 
0. 258 
0. 266 
1.6 
0.712 
0.687 
0.700 
0. 255 
0.269 
0.262 
1.0 
0. 828 
0. 600 
0.714 
0.217 
0.216 
0.217 
0.5 
0.613 
0.602 
0.608 
0.226 
0. 234 
0. 230 
7.0 
0.709 
0. 705 
0.707 
0.203 
0. 166 
0. 185 
5.5 
0. 771 
0. 740 
0.756 
0. 205 
0.196 
0. 201 
4.5 
0. 823 
0.762 
0.793 
0. 230 
0.233 
0. 232 
T1R1C1 
3.5 
0. 823 
0. 771 
0.797 
0.236 
0. 249 
0. 243 
2.5 
0. 789 
0. 763 
0. 776 
0. 241 
0.257 
0. 249 
1.6 
0.747 
0.722 
0.735 
0.257 
0.262 
0.260 
1.0 
0.650 
0.611 
0. 631 
0. 204 
0. 208 
0. 206 
0.5 
0.642 
0.610 
0.626 
0.210 
0.207 
0.209 
7.0 
0. 776 
0. 762 
0. 769 
0.271 
0.273 
0.272 
5.5 
0. 851 
0. 790 
0.821 
0.314 
0. 297 
0. 306 
l 
4.5 
0. 922 
0.885 
0. 904 
0. 329 
0.304 
0.317 
T2R4C2 
3.5 
1.056 
1.003 
1.030 
0. 371 
0. 350 
0.361 
0. 373 
2.5 
1. 164 
1.070 
1. 117 
0. 366 
0.365 
1.6 
1.165 
1. 138 
1. 152 
0. 367 
0.379 
0. 373 
1.0 
0. 994 
0.900 
0. 947 
0. 305 
0.284 
0.295 
0.5 
0.973 
0.878 
0. 926 
0.268 
0. 332 
0.300 
7.0 
0.723 
0. 642 
0.683 
0.226 
0. 221 
0.224 
5.5 
0.819 
0. 752 
0. 786 
0. 272 
0. 266 
0.269 
4.5 
0. 963 
0. 912 
0. 938 
0. 324 
0. 305 
0.315 
R5C21 
3.5 
1.016 
0. 933 
0.976 
0. 304 
0. 346 
0.325 
0.360 
2.5 
1. 127 
1. 123 
1.125 
0. 388 
0. 869 
1.6 
1. 160 
1. 143 
1. 152 
0.385 
0. 345 
0. 366 
1.0 
1.013 
0. 985 
0.999 
0.314 
C. 293 
0.304 
0.5 
0. 908 
0. 875 
0.892 
0.271 
0. 274 
0.273 
