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To J. H. Gilbert   12 January 1882


Quantity of nitrogen in castings surprises CD.

Comments on papers: [J. B. Lawes and J. H. Gilbert, "Results of experiments on mixed herbage, pt 1", Philos. Trans. R. Soc. Lond. 171 (1880): 289–416; Gilbert, Lawes and M. T. Masters, "pt 2: The botanical results", Philos. Trans. R. Soc. Lond. 173 (1882): 1181–413].

Has never made sections to see how deep worms burrow – five or six feet is probable. Wishes the problem had arisen when he made his observations.

Author:  Charles Robert Darwin
Addressee:  Joseph Henry Gilbert
Date:  12 Jan 1882
Classmark:  Rothamsted Research (GIL13)
Letter no:  DCP-LETT-13616

From J. H. Gilbert   9 January 1882


Thanks CD for Earthworms.

Discusses the problem of accounting for difference between nitrogen in permanent grassland and ordinary arable soil. Finds castings of earthworms rich in nitrogen. Asks CD if his observations enable him to explain the source. If from below top-soil, it would be a considerable manuring.

Author:  Joseph Henry Gilbert
Addressee:  Charles Robert Darwin
Date:  9 Jan 1882
Classmark:  DAR 165: 45
Letter no:  DCP-LETT-13605
Document type
letter (2)
Darwin, C. R.[X]
Gilbert, J. H.[X]
09 (1)
12 (1)