256 Journal of Agricultural Research voi. ix, No. 8 
soils under examination, using distilled water only as a solvent. The 
means of these determinations are given in Table II. 
Table II .—Average amounts of minerals removed by distilled water from the soils used 
[Results expressed as parts per million of dry soil] 
Clay loam. 
Sandy loam. 
Iron. 
Cal¬ 
cium. 
Magne¬ 
sium. 
Phosphoric 
acid. 
Iron. 
Cal¬ 
cium. 
Magne¬ 
sium. 
Phosphoric ^ 
acid. 
Average amounts re¬ 
moved. 
0. 47 
43 
12 
24 
O. 36 
39 
7 
14 
Number of determina¬ 
tions in average. 
13 
*3 
II 
II 
13 
10 
10 
IO 
These mean values have been deducted in each instance from the solu¬ 
bility of the corresponding element in the presence of the organic solvent. 
The organic solvents themselves all contained calcium, magnesium, 
iron, and phosphoric acid in solution, so that it was necessary to deter¬ 
mine the amount of each of these elements added to the soil along with 
the organic matter. These determinations are given in the first part of 
Table III, all results being expressed in parts per million of the weight of 
the dry soil used. The second part of Table III shows the concentration 
of each element in the organic solution after it had been shaken with the 
soil and freed from suspended material by filtration through a Chamber- 
land tube. In each instance, however, the amount of each element dis¬ 
solved in distilled water, as given in Table II, has been deducted. 
Table III .—Minerals removed from soils by extracts of organic substances during various 
stages of decomposition 
[Results expressed in parts per million of dry soil. Amounts removed by distilled water have been 
deducted] 
Organic sub¬ 
stances and 
Inorganic substances added 
to soil with organic extracts. 
Clay-loam soil. 
Sandy-loam soil. 
their succes¬ 
sive ex trac¬ 
tion. 
Iron. 
Cal¬ 
cium. 
Mag¬ 
ne¬ 
sium. 
Phos¬ 
phoric 
acid. 
Iron. 
Cal¬ 
cium. 
Mag¬ 
ne¬ 
sium. 
Phos¬ 
phoric 
acid. 
Iron. 
Cal¬ 
cium. 
Mag¬ 
ne¬ 
sium. 
Phos¬ 
phoric 
acid. 
Barley: 
First. 
7.00 
13 
76 
138 
0.21 
508 
105 
51 
1.69 
529 
66 
93 
Second. 
6.00 
106 
38 
69 
4.90 
358 
89 
105 
3-96 
368 
49 
8x 
Third. 
2 .40 
58 
20 
26 
.84 
232 
57 
14 
2.04 
225 
41 
21 
Fourth. 
• 75 
55 
6 
5 
. 08 
78 
5 
—2 
.09 
94 
5 
11 
Sweet clover: 
First. 
14.00 
59 
Z22 
280 
3-34 
402 
Z29 
184 
4.80 
261 
103 
196 
Second. 
23- 30 
I2S 
40 
60 
1. 00 
473 
132 
53 
1.46 
512 
92 
77 
Third. 
8- 40 
149 
20 
24 
—. 02 
185 
52 
2 
• 19 
217 
32 
II 
Fourth. 
1.10 
86 
5 
zo 
-•25 
9i 
12 
9 
.89 
99 
7 
13 
Alfalfa: 
First. 
2. 25 
211 
IS© 
184 
.66 
472 
157 
88 
.68 
426 
75 
159 
Second. 
• 75 
264 
59 
66 
•50 
S 2 3 
131 
7i 
.96 
4S0 
70 
72 
Third. 
•50 
79 
16 
23 
' *03 
195 
58 
22 
.61 
166 
21 
21 
Fourth. 
•30 
95 
10 
7 
—.42 
133 
13 
13 
—. 11 
122 
3 
14 
Cow manure: 
First. 
.84 
9r 
82 
135 
1.46 
292 
92 
49 
1.41 
211 
135 
103 
Second. 
1.17 
159 
78 
153 
*45 
216 
73 
96 
•13 
185 
Sr 
125 
Third. 
.91 
74 
36 
115 
•03 
84 
30 
43 
• 27 
99 
21 
7* 
Fourth. 
. 26 
114 
8 
67 
—. 08 
83 
16 
25 
•05 
105 
0 
43 
