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Gilbert, J. H. in correspondent 
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DCP-LETT-13605

From:
Joseph Henry Gilbert
To:
Charles Robert Darwin
Date:
9 Jan 1882
Source of text:
DAR 165: 45
Summary:

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.

Contributor:
Darwin Correspondence Project
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DCP-LETT-13616

From:
Charles Robert Darwin
To:
Joseph Henry Gilbert
Date:
12 Jan 1882
Source of text:
Rothamsted Research (GIL13)
Summary:

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.

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Darwin Correspondence Project
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