the Broad Bean and certain other Plants. 
649 
Table IV. 
Mean Dry Weights and 
Shoot 
Ratios of Barley grown in Water Culture. 
Root 
(Average of 3-5 plants}) 
Feb. 
21 -May 24, 1921. 
Concentration 
Root. 
Shoot. 
Total. 
Shoot 
of dt^b (J 3 . 
Root 
grm. 
grm. 
grm. 
Control 
3.12 
21-33 
24.45io.17 
6*84 
1 : 100,000,000 
2*91 
18-31 
21-22 + 1-32 
6-29 
1 : 12,500,000 
2-99 
24-00 
26-99 ± 0,1 5 
8-03 
1 : 2,500,000 
3 -i 9 
19-43 
22-62 + 0-71 
6-n 
1 : 500,000 
2-70 
18.85 
21*55 ±0-51 
6-98 
1 :100,000 
i -94 
15*44 
17-38 ± 0-96 
7-96 
1 : 50,000 
2*14 
14-82 
16-96 + 0-23 
6-93 
1 : 25,000 
1.22 
9-72 
10-94 + 1-47 
7*97 
1 : 5,000 
O ' 1 5 
1.42 
i *57 ±0*17 
9-46 
Table V. 
Shoot 
Mean Dry Weights and ——- Ratios of Barley grozvn in Water Culture 
J\. U(J i' 
with Boric Acid or Borax containing equivalent quantity of Boron. (Con¬ 
centrations given as H 3 B0 3 .) 
March i-May 11, 1922 (average of 5 plants'). 
Plants in the centre of the Greenhouse? 
Concentration 
Boric Acid. 
Shoot 
Borax. 
Shoot 
of H z BO%. 
Root. 
Shoot. 
7 'olat. 
Root 
Root. 
Shoot. 
Total. 
Root 
grm. 
grm. 
grm. 
grm. 
grm. 
grm. 
Control 
1*53 
9*37 
10-90 
6-i 
i *53 
9-37 
10-90 
6-1 
1 :100,000,000 
i-6o 
8-92 
10.52 
5.6 
1-76 
9*74 
11-50 
5-5 
1 : 12,500,000 
i-6i 
9-08 
10-69 
5*6 
1-64 
9*47 
11-11 
5.8 
1 : 2,500,000 
1-44 
7.30 
8.74 
5 *i 
J *73 
8*55 
10.28 
4*9 
1 : 500,000 
i-68 
7*73 
9 - 4 1 
4-6 
i -55 
8.16 
9.71 
5*3 
1 : 100,000 
1-40 
6-88 
8-28 
4*9 
1.31 
7*47 
8.7S 
5-7 
1 : 50,000 
0.99 
5*85 
6-84 
5-9 
o-8o 
5 * *9 
5-99 
6.5 
Plants at the side of the Greenhouse. 
(.Average of $ plants.) 
Concentration 
Boric 
Acid. 
Shoot. 
Borax. 
Shoot 
oj -ISB 
Root. 
Shoot. 
Total. 
Root 
Root. 
Shoot . 
Total. 
Root 
grm. 
grm. 
grm. 
grm. 
grm. 
grm. 
Control 
1*90 
9.78 
11.70 
5 ”i 
1.90 
9.78 
11.70 
5 -i 
1 :100,000,000 
i -75 
8*62 
10.37 
4.9 
2-06 
9*35 
11-40 
4*5 
1 : 12,500,000 
1.62 
8.27 
9.S9 
5 *i 
1 -5 8 
7-33 
8-91 
4.6 
1 : 2,500,000 
i -33 
5 - 9 2 
7-25 
4*5 
T *54 
8*02 
9.56 
5-2 
1 : 500,000 
i -35 
5*98 
7-33 
4.4 
i -75 
7.70 
9-45 
4-4 
1 :100,000 
1*16 
5-87 
7*°3 
5 -i 
1.18 
6*io 
7-28 
5-2 
1 : 50,000 
0.83 
4.72 
5-55 
5-7 
o«88 
4*57 
5*45 
5.2 
1 Reduction 
in the 
average number was 
unavoidably due to death 
or abnormally poor 
develop- 
ment of plants. 
2 Owing to lack of space in the greenhouse with similar conditions of illumination, the experi¬ 
ment was divided into two equal parts and the dry weights considered separately. 
