210 The Woburn Pot-Culture Experiments , 1904. 
Table II. — (a) Influence of Sulphate of Manganese and 
Sulphate of Iron on Barley , 1904 ; ( b ) Influence oj 
Silicates of Potash and Soda on Barley , 1904. 
Applications 
Length 
of straw 
Length 
of ear 
Weight 
of corn 
Weight 
of straw 
1 . 
Untreated ..... 
Inches 
16-25 
Inches 
2-52 
Grammes 
7-24 
Grammes 
9-30 
2 . 
Seed-soaking, sulphate of manganese, 
1 per cent. ..... 
17-20 
2-95 
6-91 
11-29 
3 . 
Seed-soaking, sulphate of manganese, 
2 per cent. ..... 
16-65 
2-86 
9-28 
11-04 
4 . 
Seed-soaking, sulphate of manganese, 
5 per cent. ..... 
17-86 
2-52 
8-57 
10-72 
5 . 
Seed-soaking, sulphate of iron, 1 
per cent. ..... 
18-03 
2-86 
7-30 (?) 
10-11 (?) 
6 . 
Seed-soaking, sulphate of iron, 2 
per cent. ..... 
17-00 
2-80 
7-55 (?) 
11-82 (?) 
7 . 
Seed-soaking, sulphate of iron, 5 
per cent. ..... 
15-87 
2-59 
6-66 (?) 
10 - 70 (?) 
8 . 
Sulphate of manganese, f cwt. per 
acre ...... 
17-20 
2-80 
7-54 
11-14 
9 . 
Sulphate of manganese, ^ cwt. per 
acre ...... 
16-45 
2-75 
8-01 
10-23 
10 . 
Sulphate of manganese, 1 cwt. per 
acre ...... 
15-90 
2-63 
8-09 
11-02 
11 . 
Sulphate of iron, \ cwt. per acre 
16-60 
2-71 
9-35 
11-85 
12 . 
1 
?? n 2 n n 
17-68 
2-80 
8-39 
12-24 
13 . 
?> ii t ,, ,, 
16-00 
2"56 
7 - 13 (?) 
11-87 (?) 
14 . 
Silicate of potash, 2 cwt. per acre . 
16-95 
3-04 
8-63 
12-16 
15 . 
4 
77 v ^ 77 77 
17-13 
2-75 
8-11 
12-44 
16 . 
Silicate of soda, 2 cwt. per acre 
15-45 
2-96 
9-43 
12-44 
17 . 
4 
77 77 T 7 7 7 7 
13-46 
2-93 
7*93 (?) 
12-83 (?) 
An examination of this Table will show that the differences 
are, in general, but small, and not of the marked character 
found with wheat. The seed-soaking was, no doubt, influenced 
to some extent by the hard exterior coating of the grain, for 
there is no clear proof of the applications, even in the stronger 
solutions, having done harm, while with wheat this would be 
clearly traced. So far as differences were shown, it would 
seem that soaking the seed in solutions of sulphate of man- 
ganese was better than the similar use of sulphate of iron, the 
latter showing no improvement on the untreated lots, whereas 
sulphate of manganese did. Direct applications of sulphate of 
manganese and sulphate of iron to the growing plants brought 
about some increase, more particularly in the case of sulphate 
of iron. Owing to irregularities, however, it could hardly be 
said in what quantity the salts had better be used. As to the 
use of silicates of potash and soda, it was very clear that both 
salts, in whichever quantities used, gave a decided increase in 
