image EL_L3_26_Fig
Image number: RS.15789
Credit: ©The Royal Society

Gall nuts on the leaf of a willow tree and the larvae of a sawfly


28 January 1701


Unknown, Artist

Object type

Archive reference number

Manuscript page number




height (page): 224mm
width (page): 175mm



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

Fig. A: leaf of a willow tree
Fig. 1: little fly, in real size
Fig. 2: a sting-like part, which under the microscope turned out to be closed (and therefore cannot be a sting) and covered with hairs
Fig. 3: the sting, after being separated from its 'case'
Fig. 4: a detail of the sting shown in fig. 3
Fig. 5: the second case
Fig. 6: a larva
Fig. 7: a pupa.

Object history

The Journal book mentions on 26 February 1700/1, 'A Letter was read from Mr Leeuwenhoek, wherein he gives an Account of Worms on Willows, & of Cheese-mites. He was order'd the Thanks of the Society' (JBO/10/212).

The letter with images was printed in:
A. Leeuwenhoek, ‘Concerning Excrescencies Growing on Willow Leaves’, Phil. Trans. vol. 23, no. 269 (February 1701), pp. 786-92.
A. van Leeuwenhoek, Sevende vervolg der brieven (Delft: H. van Krooneveld, 1702), pp. 308-19.
A. van Leeuwenhoek, Epistolae Ad Societatem Regiam Anglicam (Leiden: J. A. Langerak, 1719), pp. 293-303.

Related Fellows

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

Associated place

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