Jan., 1923] BAKKE AND ERDMAN — CULTURES OF MARQUIS WHEAT 
23 
electrode vessel and hydrogen gas was bubbled through for several minutes. 
The exit tube was then closed and the vessel was shaken for two minutes, 
after which processes a reading was made. These processes were repeated 
until a constant reading was obtained. The voltmeter readings were 
transformed into pH values from the tables prepared for this purpose by 
Schmidt and Hoagland (16). 
Results 
When the more advanced cultures were just beginning to head out, 
each culture, containing five plants, was harvested as a whole in the usual 
manner. The tops were placed in weighed beakers, and the green weights 
were recorded. They were then dried to constant weight in an electric 
oven. Likewise, the roots were dried in the same manner and weighed. 
The roots of the sand cultures were first thoroughly washed free from sand. 
The data for total absorption, fresh and dry weights of tops, and the 
dry weight of roots for the sand and water cultures are given in table 2. 
The five sand and water cultures showing the greatest transpiration, the 
highest fresh weight of tops, and the largest dry weight of tops and roots 
are marked H. Likewise the five lowest cultures in each case are marked L. 
Table 2. Total Absorption for the Growth Period , the Fresh Weight of Tops, and 
the Dry Weight of Tops and Roots, of Water and Sand Cultures 
Solution 
Number 
Total 
Absorption 
(grams) 
Fresh Wt. 
of Tops 
(grams) 
Dry Weight 
Tops (g.) 
Roots (g.) 
Water 
Sand 
Water 
Sand 
Water 
Sand 
Water 
Sand 
III (1.00 atm.) 
R1S1. 
4866 
3685 
44.6 
24.1 
9.786H 
5.461 
2.741H 
5.998 
S2. 
4254 
3655 
37-8 
24-5 
7.626 
5-731 
2.951H 
7.006H 
S3. 
3174 
1774L 
32.5 
7.9L 
5748 
1.693L 
1.996 
2.183L 
S4. 
382L 
2248L 
2.5 
12.iL 
0.125L 
2.597L 
0.198L 
3-947 
S5. 
167L 
1576L 
0.7L 
4-3L 
0.025L 
1.364L 
1.146L 
22.672L 
S6. 
91L 
998L 
0.1L 
1.9L 
0.041L 
0.857L 
0.082L 
1.869L 
R2S1. 
6203H 
3935 
65.5H 
31-7 
15.828H 
6.045 
2.730 
6.678H 
S2. 
4647 
4078 
48.0 
33-2 
12.860H 
6.992 
2.490 
12.547H 
S3. 
3997 
3526 
47:0 
37-5 
7.126 
5-398 
2-454 
7-254H 
S 4 . 
1503 
3882 
4-5 
29.9 
1.677 
7.262 
0-493 
6.360 
S5. 
120L 
2730L 
0.3L 
18.3L 
0.140L 
3-945L 
0.138L 
3.589 
R3S1. 
4922 
3778 
47.8 
36.3 
10.147H 
5-857 
2.507 
4-391 
S2. 
5825H 
4312 
62.7H 
36.4 
9.440H 
7.842H 
3.867H 
7.461H 
S3. 
3430 
4499H 
38.0 
43.2H 
4769 
8.992H 
1.992 
5-740 
s 4 . 
288L 
4253 
1.0L 
34*3 
0.275L 
7-389 
0.222L 
4.894 
R4S1. 
4936 
4459H 
55-iH 
32.6 
8.861 
5.462 
2.413 
1.858L 
S2. 
4905 
4578H 
55-oH 
50.0H 
7.98b 
7.880H 
3.675H 
3.648 
S3. 
518 
4377H 
1.9L 
45.2H 
0.396 
8.665H 
0.244 
3-2I5L 
R5SI. 
5207H 
4254 
60.0H 
38.3 
9.050 
6.142 
2.260 
5.261 
S2. 
5306H 
4707H 
53-2 
48.2H 
6.726 
7.981H 
2.839H 
2.904 
R6Sl. 
5063H 
4305 
52.0 
38.5H 
7-593 
6.123 
1.663 
2.476 
Shive’s R5C2 
(1.75 atm.). . . 
3147 
35H 
34-2 
26.6 
5-563 
4-695 
2.582 
2.805 
3669 
3323 
23.0 
20.7 
« 
7.365 
4-i4i 
3-355 
2.526 
