[Vor. 7 
20 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
TABLE VII 
(Series 3, Wheat) 
SALT REQUIREMENTS AND H-ION CONCENTRATION IN RELATION TO GROWTH; 
SOLUTIONS A, B, AND C; RENEWAL EVERY FOUR DAY 
Total | Total | Greatest Pu 
No. poe gr. wt. |dry wt.| length 
— (gms.) |(gms.) (cm.) | Initial [End 2nd per.|End 4th per. 
1 |AwO 1.92 10.325 12.02 4.8 4.8 4.8 
2 |Aw9/10K,| 7.92 [1.054 18.04 5.8 5.6 6.0 
3 |Aw4/5K 6.27 10.776 17.08 5.8 5.5 5.5 
4 |Aw3/5K 6.36 |0.814 | 14.82 6.0 5.8 5.8 
5 |Aw1/2K | 10.18 |1.211 | 20.52 6.1 5.7 6.1 
6 |Aw3/10K| 6.55 /|0.789 | 17.12 6.4 6.1 6.1 
7 |Awh/Al 5.21 /|0.862 | 17.26 3.6 3.6 5.3 
8 |AwAI 6.39 (0.893 | 17.60 5.3 5.4 5.8 
9 8.24 |1.124 | 19.96 5.9 Td 7.1 
10 |2(BwO) 7.65 |1.010 | 19.27 5.8 7.3 8.0 
11 |Bwk, 3.22 (0.500 | 15.00 7.1 7.4 7.8 
12 |BwCa 6.47 10.950 21.34 7.6 7.6 7.8 
13 |BwAI 13.85 |1.954 | 25.33 7.1 7.4 7.7 
14 |CwO 5.60 0.683 14.89 4.8 5.6 6.5 
15 |CwNH 3.71 [0.603 | 14.87 4.8 4.6 4.8 
16 |CwGC 5.29 10.796 16.21 6.7 7.0 7.8 
17 |CwGP 4.37 10.640 | 14.10 7.1 7.0 7.4 
18 |Cw /1l 8.44 11.045 18.54 5.8 5.8 7.2 
19 |Cw /2 7.72 |1.022 | 16.96 5.8 6.0 6.6 
20 |Cw /5 6.15 10.928 16.23 6.4 6.4 7.3 
21 |CwAI 8.20 |1.178 20 :74 5.4 5.8 7.0 
Series 3 was arranged with a view to repeating some of the 
work previously conducted and likewise to an extension of it. 
Two plants, wheat and corn, were employed, and the subdivi- 
sions of the series may be appropriately designated 3w4, 3w10, 
3c4, and 3c10, indicating respectively (3w4) cultures with wheat, 
solutions renewed every 4 days; (3w10) cultures with wheat, 
solutions changed every 10 days; (3c4) cultures with corn, solu- 
tions changed every 4 days; and (3c10) cultures with corn, 
solutions changed every 10 days. In this case, therefore, a 
culture of any plant in a particular solution with a change of 
solution every 4 days, was duplicated by a similar culture in 
which the solution was renewed every 10 days. 
Sections 3w4 and 3c4 of this series were grown on the rotating 
table, while sections 3w10 and 3c10 were grown in another green- 
