the inorganic matters, it is to be observed
that some of them occur in each of the three heads under which they are
arranged, while others are confined to one or two. Silica and the
alkalies occur generally, though not invariably, in all three. Chlorine
is met with only in the part soluble in water, phosphoric acid only in
that soluble in acids, while sulphuric acid occurs in both the
last-named divisions.

The greater part of the organic matters are insoluble both in water and
acids. At least it is generally believed that any portion dissolved by
strong acids, in the course of analysis, has been entirely decomposed,
and is in a completely different state from that in which it existed
actually in the soil.

As an example of a calcareous soil, forming a striking contrast to those
given above, we select one from the island of Antigua, from which very
large crops of sugar-cane are obtained. The soil is of great depth, and
analyses of the subsoil at the depth of 18 inches and 5 feet are given.
These last analyses are not so minute as that of the soil itself, the
soluble matters not having been separately determined, but included in
that soluble in acids.

+-----------------------------+---------+-----------+--------+
| | Surface | 18 inches | 5 feet |
| | Soil. | deep. | deep. |
+-----------------------------+---------+-----------+--------+
| SOLUBLE IN WATER. | | | |
| | | | |
| Lime | 0.07 | ... | ... |
| Magnesia | trace | ... | ... |
| Potash | 0.06 | ... | ... |
| Soda | 0.04 | ... | ... |
| Chlorine | 0.05 | ... | ... |
| Organic matter | 0.15 | ... | ... |
| | ---- | | |
| | 0.37 | | |
| SOLUBLE IN ACIDS. | | | |
| | | | |
| Silica | 0.74 | ... | ... |
| Peroxide of iron | 2.22 | 1.67 | 1.87 |
| Protoxide of iron | 0.77 | 9.05 | 3.10 |
| Alumina | 1.90 | 2.52 | 4.21 |
| Lime