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THOMAS-PHOSPHATE OR BASIC SLAG.
INDIRECT MANURES—GYPSUM, SALT, ETC.
MANURING OF THE COMMON FARM CROPS.
ON THE METHOD OF APPLICATION AND ON THE MIXING OF MANURES.
ON THE VALUATION AND ANALYSIS OF MANURES.
| PART I.—HISTORICAL INTRODUCTION. | |||
| PAGE | |||
| Beginning of agricultural chemistry | 4 | ||
| Early theories regarding plant-growth | 4 | ||
| Van Helmont | 4 | ||
| Digby | 6 | ||
| Duhamel and Stephen Hales | 8 | ||
| Jethro Tull | 9 | ||
| Charles Bonnet's discovery of source of plants' carbon | 11 | ||
| Researches of Priestley, Ingenhousz, Sénébier, on assimilation of carbon | 11–12 | ||
| Publication of first English treatise by Earl Dundonald | 13 | ||
| Publication of Theodore de Saussure, 'Chemical Researches on Vegetation,' 1804 | 14 | ||
| Theories on source of plant-nitrogen | 15 | ||
| Early experiments on this subject | 16 | ||
| Sir Humphry Davy's lectures (1802–1812) | 17 | ||
| State of agricultural chemistry in 1812 |
17
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