Requests further information on subsidence of flagstones because of action of worms.

Sends description and measurements of the 18th century courtyard pavement of his house, the stones of which have sunk as a result of earthworm action [see Earthworms, pp. 192–3].

Further details and measurements of the stones in the courtyard pavement for CD’s investigation of earthworm action.

Thanks for ACR’s Physical geology [5th ed. (1878)]; delighted with its success, proving there is a large body of men in England capable of appreciating sound geological science.

Notes on worm action, and CD’s questions concerning source of nutriment for worms in ACR’s courtyard [see Earthworms, pp. 192–3].

Further details of pavement that sank from action of earthworms. There were plenty of castings, which first led him to think worms were involved.