VARIATION IN THE CHEMICAL COMPOSITION OF SOILS. 
Table 2. — Chemical analyses of certain American soils. 
[Analyses by W. O. Robinson.] 
Province and type. 
Coastal Plain: 
Norfolk sandy 
loam- 
Soil 
Subsoil 
Limestone Valleys: 
Decatur clay 
loam — 
Soil 
Subsoil 
Hagerstown 
loam- 
Soil 
Subsoil 
Glacial and Loessial: 
Volusia silt 
loam — 
Soil 
Subsoil 
Marshall silt 
loam — 
Soil 
Subsoil 
Gloucester stony 
loam- 
Soil 
Subsoil I 
Piedmont Plateau: ' 
Cecil clay- 
Soil 
Subsoil 
Cecil sandy 
loam- 
Soil 
Subsoil 
Durham sandy 
loam- 
Soil 
Subsoil ! 
York silt loam- 
Soil 
Subsoil — 
Louisa loam- 
Soil 
Subsoil.... 
Penn silt loam 
Soil 
Subsoil... 
Depth. 
Inches. 
0-14 
14-36 
0- 4 
4-15 
0- 8 
8-24 
0- 8 
8-36 
0-15 
15-36 
0- 8 
8-36 
0- 6 
6-36 
0- 8 
8-36 
0-10 
10-36 
0-10 
10-22 
0-12 
12-30 
-24 
Constituent. 
Si0 2 
Per ct. 
94.50 
85.30 
79.35 
74.81 
70.99 
66.49 
75.12 
74.64 
75.61 
71.43 
65.68 
73.80 
66.49 
44.15 
88.57 
55.69 
80.79 
69.35 
76.71 
74.38 
84.58 
74.99 
74.33 
71.76 
Al 2 O a 
Perct. 
2.07 
8.82 
8.89 
12.80 
11.39 
14.80 
10.49 
12.26 
9.67 
13.44 
14.15 
13.24 
17.11 
27.58 
5.76 
24.42 
10.55 
18.04 
12.85 
16.31 
5.54 
10.90 
11.00 
14.36 
Fe 2 3 
Per ct. 
0.83 
1.91 
4.44 
5.28 
4.13 
5.01 
3.54 
4.28 
5.67 
4.37 
7.43 
16.23 
1.55 
8.83 
1.61 
3.42 
2.81 
2.56 
3.30 
6.75 
4.64 
5.82 
CaO. 
Per ct. 
0.39 
.63 
.40 
1.08 
1.40 
1.36 
1.19 
.36 
.44 
.72 
1.13 
1.73 
MgO. 
Per ct. 
0.09 
.19 
1.08 
1.93 
4S 
.77 
1.28 
. 83 
.39 
.31 
.29 
.38 
1.06 
K 2 0. i Na 2 0. 
Perct. 
0.10 
.12 
2.71 
3.58 
1.40 
1.99 
2.28 
2.03 
2.16 
2.22 
.62 
.61 
.82 
1.06 
3.96 
3.34 
3.26 
4.07 
1.57 
1.50 
Per ct. 
0.11 
.07 
. 90 
. 99 
1.03 
.63 
1.39 
1.75 
.16 
.14 
.87 
1.53 
P 2 0, 
Per ct. 
0.06 
.04 
S0 3 
Perct. 
0.07 
.13 
.34 
.14 
10 
