| 10.43 | 3.04 | 25.75 |
| Magnesia | 0.20 | 0.54 | 0.51 |
| Potash | 0.03 | 0.29 | 0.28 |
| Soda | 0.02 | 0.11 | 0.16 |
| Sulphuric acid | trace | 0.02 | 0.13 |
| Phosphoric acid | 0.14 | trace | 0.04 |
| Carbonic acid | 7.38 | 0.82 | 20.23 |
| | ----- | ----- | ----- |
| | 23.83 | 18.06 | 56.28 |
| | | | |
| INSOLUBLE IN ACIDS. | | | |
| | | | |
| Silica | 41.44 | 51.24 | 27.67 |
| Protoxide of iron | 3.24 | 0.26 | 1.40 |
| Alumina | 9.00 | 1.50 | 1.00 |
| Lime | 0.08 | 0.88 | trace |
| Magnesia | 0.80 | 0.54 | trace |
| Potash | ... | 0.74 | ... |
| Soda | ... | 0.25 | ... |
| | ----- | ----- | ----- |
| | 54.56 | 55.41 | 30.07 |
| ORGANIC MATTERS. | | | |
| | | | |
| Humine | 1.58 }| | |
| Humic acid | 1.15 }| 12.05 | 7.49 |
| Insoluble organic matters | 7.66 }| | |
| Water | 11.13 | 14.69 | 6.06 |
| | ----- | ----- | ----- |
| | 21.52 | 26.74 | 13.55 |
| +---------+-----------+--------+
| Sum of all the constituents | 100.28 | 100.21 | 99.90 |
| |=========|===========|========|
+-----------------------------+---------+-----------+--------+

In this soil there is a general resemblance in the composition of the
portion soluble in water to those of the wheat soils. But the part
soluble in acids is distinguished by the great abundance of carbonate of
lime.

The subsoil contains also a large quantity of protoxide of iron, a
substance frequently found in subsoils containing much organic matter,
and to which the air has imperfect access. Under th