"References" at the end of most of the chapters Preface.--Biographical introduction [Sir John Bennet Lawes, Sir Joseph Henry Gilbert. By R. Warington. Reprinted from the obituary notices of the Royal society]--The sources of the nitrogen of vegetation.--Meteorological observations.--The composition of the Rothamsted soil.--Experiments upon wheat.--Experiments upon barley.--Experiments upon oats.--Experiments upon root-crops grown continuously on the same land.--Experiments upon the continuous growth of leguminous crops.--Experiments upon grass land mown for hay every year.--Experiments upon crops grown in rotation, Agdell field.--Nitrification and the composition of drainage waters.--The feeding experiments.--Miscellaneous enquiries.--Appendix I: I. List of publications issued from the Rothamsted experimental station, 1843-1905 p. [273]-283. II. Publications by other investigators, dealing with material from Rothamsted: p. 283-284. III. Other publications dealing with the Rothamsted experiments: p. 284-285.--Appendix II: Officials.--Appendix III: List of past and present workers at the Rothamsted experimental station.--Index