Bog-Earth, or peat earth, is the soil requited for a class of plants that are generally designated American, though not all of them are natives of that quarter of the globe. Bog-earth of the best description is thus constituted: -

Fine siliceous sand . . .

156

Unaltered vegetable fibre

2

Decomposing vegetable matter ........................

110

Silica (Flint)......

102

Alumina (clay) ................

16

Oxide of iron ..............

4

Soluble vegetable and saline matter ........

4

Muriate of lime ....

4

Loss ........................

2