310  The  Wohurn  Pot-Culture  Experiments,  1903. 
through  the  failure  of  the  other  plants.  By  the  middle  of  July 
there  were  only  seven  plants  in  the  two  manganese  iodide  pots, 
two  in  the  potassium  iodide  and  sodium  iodide  series,  and  four 
in  the  lithium  iodide  pots. 
Table  1. — Influence  of  Iodides  and  Oxides  of  Manganese, 
Potassium,  Sodium,  and  Lithium  on  Wheat,  1903. 
Applications  per  acre 
Length 
of  straw 
Length 
of  ear 
Weight  of 
corn 
Weight  of 
straw 
Percent,  of 
Per  cent,  of 
Inches 
Inches 
untreated 
untreated 
1.  Untreated  ..... 
29-8 
2-90 
100-0 
100-0 
2.  Manganese  iodide  (MnU),  1 cwt. . 
23-5 
2-77 
17-7 
67-8 
3.  Potassium  ,,  1 cwt. 
24-9 
2-53 
56-4 
78-3 
4.  Sodium  „ „ „ 
27-9 
3-00 
82-4 
107-8 
5.  Lithium  „ „ 
6.  Manganese  oxide  (Mn304),  2 cwt. 
26-0 
2-73 
76-8 
89-2 
31-3 
2-87 
112-0 
108-1 
7.  Potassium  ,,  2 cwt. 
28-9 
2-96 
119-6 
129-0 
8.  Sodium  „ „ „ 
30-8 
2-96 
110-6 
121-2 
9.  Lithium  „ „ „ 
25-2 
2-90 
130-6 
143-4 
Table  II. — Influence  of  Iodides  and  Oxides  of  Manganese, 
Potassium,  Sodium,  and  Lithium  on  Barley,  1903- 
Applications  per  acre 
Number 
of  plants 
Length 
of  straw 
Length 
of  ear 
Weight  Of 
corn 
Weight  of 
straw 
1.  Untreated 
12 
Inches 
18-0 
Inches 
1-85 
Grammes 
16-39 
Grammes 
20-75 
2.  Manganese  iodide  (Mnij), 
2 cwt. 
7 
18-2 
2-95 
14-72 
24-17 
3.  Potassium  iodide,  2 cwt.  . 
2 
3-4 
no  ears 
none 
15-60 
4.  Sodium  „ „ „ 
2 
6-9 
one  ear 
4-55 
29-86 
5.  Lithium  „ „ ,, 
4 
6-4 
only 
one  ear 
2-19 
27-62 
6.  Manganese  oxide  (MnjO^), 
2 cwt. 
12 
17-2 
only 
2-10 
12-90 
22-12 
7.  Potassium  oxide,  2 cwt.  . 
12 
15-8 
2-02 
13-80 
20-80 
8.  Sodium  „ ,,  „ 
12 
17-0 
2-10 
15-73 
25-19 
9.  Lithium  „ „ „ 
11 
18-2 
2-20 
13-30 
30-62 
Meanwhile  a marked  contrast  was  shown  in  the  case  of  the 
plants  treated  with  the  oxides  of  manganese,  &c.  In  place  of 
failure,  there  was,  as  with  the  wheat,  improvement,  and  all 
the  plants  looked  healthy  and  vigorous,  more  particularly  the 
lithium  oxide  series  ; here  the  leaf  was  very  broad  and  the 
tillering  out  very  good.  This  apparent  advantage,  however. 
