image EL_L3_23_fig2
Image number: RS.15786
Credit: ©The Royal Society

Microscopic images of a louse and cocoons of flies


26 October 1700


Unknown, Artist

Object type

Archive reference number

Manuscript page number




height (page): 223mm
width (page): 174mm



Four figures in a letter by Antoni van Leeuwenhoek to Hans Sloane.

Fig. 1: the size of the animal, called louse, as seen with the naked eye.
Fig. 2: the outside of this louse as seen with a magnifying glass; the inside of the animal was eaten by a little larva.
Fig. 4: small part of the abdomen of a pupa.
Fig. 5: the hind part of the abdomen of the above-mentioned pupa.

Object history

The Journal Book mentions on 27 November 1700, 'A Letter from Mr: Lewenhoek to Dr Sloane dated Delft Oct 26th 1700 with an excellent account, & curious observations of Insects on Fruit Trees and their Production. The Dr was desired to let it be printed in the Transactions & also to returne Mr Lewenhoeck the societys thanks' (JBO/10/203).

The images and letter are published in:
Phil. Trans. vol. 22, no. 266 (Sept/Oct 1700), pp. 659-72. With five figures.

A. van Leeuwenhoek, Sevende vervolg der brieven (Delft: H. van Krooneveld, 1702), pp. 275-94.

A. van Leeuwenhoek, Epistolae Ad Societatem Regiam Anglicam (Leiden: J. A. Langerak, 1719), pp. 263-80.

Related Fellows

Antoni van Leeuwenhoek (1632-1723, Dutch), Naturalist
Hans Sloane (1660-1753, Irish), Physician

Associated place

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