|air-dry, No. 25 after two year's weathering.
27. " " |moist, fresh dug, good substitute for yard
| manure as top-dressing on grass.
28. Albert Day | " coherent and hard; fresh dug, but from
| surface where weathered; injurious to
| crops; vitriol peat. (?)
29. C. Goodyear |air-dry, very hard tough cakes; when fresh dug,
| "as good as cow dung."
30. Rev. Wm. Clift |moist, from an originally fresh water bog,
| broken into 100 years ago by tide, now
| salt marsh; good after weathering.
31. Henry Keeler |air-dry, leaf-muck, friable; when fresh, appears
| equal to good yard manure.
32. John Adams |moist, overlies shell marl, fresh or weathered
| does not compare with ordinary manure.
33. Rev. Wm. Clift |air-dry, from bottom of salt ditch, where tide
| flows daily; contains sulphate of iron.

FOOTNOTES:

[2] The oxygen thus absorbed by water, serves for the respiration of
fish and aquatic animals.

[3] This sample contained also fish-bones, hence the larger content of
nitrogen was not entirely due to absorbed ammonia.

[4] Reichardt's analyses are probably inaccurate, and give too much
ammonia and nitric acid.

[5] These analyses were executed--A by Professor G. F. Barker; B by Mr.
O. C. Sparrow; C by Mr. Peter Collier.

[6] _Shell marl_, consisting of fragments and powder of fresh-water
shells, is frequently met with, underlying peat beds. Such a deposit
occurs on the farm of Mr. John Adams, in Salisbury, Conn. It is eight to
ten feet thick. An air-dry sample, analyzed under the writer's
direction, gave results as follows:

"Water 30.62
{soluble in water 0.70}
Organic matter { } 6.52
{insoluble in water 5.82}
Carbonate of lime 57.09
Sand 1.86
Oxide of iron and alumina, with traces of potash,
magnesia, sulphuric and phosphoric acid 3.91