image EL_L4_81_Fig
Image number: RS.15820
Credit: ©The Royal Society

Observations of calluses on hands and feet


7 July 1722


John Sturt (1658-1730, British), Engraver

Object type

Archive reference number

Manuscript page number





height (page): 63mm
width (page): 175mm



Three etched images. The original drawings can be found in Letter Book 15 (LBO/15/273). The printed images are cut out from the Philosophical Transactions of the Royal Society, vol. 32, no. 373 (1723). Leeuwenhoek had the images drawn for him.

Engraved by J. Sturt (signature on copper plate), on the same plate as the images of the sheep foetus (EL/L4/79/007).

Letter from Antoni van Leeuwenhoek to the Royal Society.

Fig. 6: a small bit of callus.
Fig. 7: the layers of callus, showing the growth day by day (observed with a microscope).
Fig. 8: an even thinner bit of skin.

Object history

Figures printed as A. Leeuwenhoek, 'Observations upon the callus of the hands and feet', Phil. Trans. vol. 32, no. 373 (1723), pp. 156-61.

Related Fellows

Antoni van Leeuwenhoek (1632-1723, Dutch), Naturalist

Associated place

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