[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 | ||
| Organic matter | {soluble in water | 0.70 } | 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 | ||
| 100.00 | |||
Another specimen from near Milwaukee, Wis., said to occur there in immense quantities underlying peat, contained, by the author's analysis—
| Water | 1.14 |
| Carbonate of lime | 92.41 |
| Carbonate of magnesia | 3.43 |
| Peroxide of iron with a trace of phosphoric acid | 0.92 |
| Sand | 1.60 |
| 99.50 |
[7] To the kindness of Joseph Sheffield, Esq., of New Haven, the author is indebted for facilities in carrying on these experiments.
[8] At the instigation of Henry A. Dyer, Esq., at that time the Society's Corresponding Secretary.
[9] Derived from the communications published in the author's Report. Trans. Conn. State Ag. Soc. 1858 p.p. 101-153.