1889

  1. On the present position of the question of the sources of the nitrogen of vegetation, with some new results, and preliminary notice of new lines of investigation
  2. History of a field newly laid down to permanent grass
  3. Results of experiments at Rothamsted, the growth of leguminous crops, for many years in succession on the same land; being (with additions) a lecture delivered November, 1, 1889, at the Royal Agricultural College, Cirencester