[Vor. 7 
22 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
TABLE IX 
(Series 3, Corn) 
SALT pico dla AND H-ION CONCENTRATION IN void TO GROWTH; 
LUTIONS A, B, AND C; RENEWAL EVERY FOUR DA 
Gr. wt.| Total | Great- Pu 
Culture Total of dry | est 
No indices $ W* roots | wt. length 
(gms.) (gms.)| (gms.)| (em.) | Initial [End 2nd per.|End 4th per. 
1 [Ach/ 9.55 | 1.70| 1.422) 16.78| 3.4 3.4 5.2 
2 |Ach/2 32.10| 7.08| 3.301| 27.92) 3.7 4.1 5.6 
3 |AcO 50.61, 12.94| 4.716| 35.74| 4.8 4.8 5.6 
4 |Ac9/10K | 33.08| 10.24| 3.015| 26.58} 5.3 5.6 5.8 
5 |Ac4/5K | 41.12 10.13) 3.898| 30.50| 5.5 5.3 6.2 
6 |Ac3/5 K | 40.90) 9.76) 3.820) 29.601 6.0 5.6 6.3 
7 |Àc1/2K | 40.80| 12.98| 3.434 20.08| 6.1 5.6 6.9 
8 |Ac3/10 K | 47.20) 15.24) 3.915| 31.75| 6.4 6.0 6.9 
9 |Ac h/AI 16.57| 3.82) 2.117, 19.93) 3.6 4.6 5.3 
10 |AcAI 27.78| 7.85| 3.288| 23.05| 5.3 5.2 6.3 
11 |BcO 36.06| 9.65) 4.107) 29.32 5.9 6.8 6.8 
12 |2BcO 49.72 13.75| 5.159) 34.11| 5.8 7.1 7.0 
13 |BeK, 43.23, 12.12| 4.290| 30.94 1.1 7.0 7.0 
14 |BeCa 36.41| 11.01) 4.305) 29.78| 7.6 7.2 7.2 
15 ¡BcAl 37.90| 12.45| 4.597, 32.46| 7.1 7,1 5.7 
16 |CcO 29.02| 8.58| 2.920) 23.95| 4.8 5.2 3 
17 |CcNH 20.44) 4.68| 2.307, 22.44| 4.3 4.6 4.6 
18 |CeGC 33.33| 9.86| 3.210) 25.82) 6.7 6.8 tat 
19 |CcGP 32.82} 8.83) 3.061, 26.57| 7.1 6.6 7.8 
20 [Ce /1 35.83| 10.82| 3.437| 29.01 5.3 5.6 7.8 
21 ¡Cc /2 35.32, 8.80] 3.306| 27.84. 5.8 01 7.0 
22 |Ce /5 35.70| 10.25) 3.271, 28.18| 6.4 6.4 8.0 
23 |CcAI 41.83, 12.33) 4.201) 29.98 5.4 5.7 7.6 
of the potassium and phosphate ions. The stock solution of 
this salt was made to contain the same number of gram atoms 
of PO, as the stock solution of KH;PO,. These solutions were 
then combined so that the ratios of monobasic to dibasie phos- 
phate were respectively 9: 1, 4: 1, 3: 2, 1: 1, and 3: 7, the culture 
indices being Ax 9/10 K, Ax 4/5 K, Ax 3/5 K, Ax 1/2 K, and 
Ax 3/10 K, with the Pg of the solutions affected as indicated in 
the tables. In culture AxO, another high grade of KH;PO, was 
employed, and the Pg exponent is higher than the theoretical; 
while in the Ax h/1 cultures, used especially in the case of corn, 
the more acid grade is employed. Ac h/2 is intermediate in 
