image EL_L2_41_Fig
Image number: RS.15775
Credit: ©The Royal Society

Observations on the reproduction of eels


16 September 1692


Unknown, Artist

Object type

Archive reference number

Manuscript page number




height (page): 175mm
width (page): 173mm



14 figures in a letter from Antoni van Leeuwenhoek to the Royal Society. The original drawings are lost.

Fig. 1: head of a worm in the intestines of an eel
Fig. 2: worms as they appear to the naked eye
Fig. 3: oval shaped eels
Figs 4-5: parts in the wombs of eels
Fig. 6: creature in womb of an eel
Fig. 7: small piece of an eel
Fig. 8: part of an eel with pins inserted
Fig. 9: globules from womb or naval blood
Fig. 10: glass syringe filled with mercury.

Object history

The letter was also published with the same printed images in:
A. van Leeuwenhoek, Derde Vervolg der Brieven (Delft: H. van Kroonevelt, 1693), pp. 508-31.
A. van Leeuwenhoek, Arcana Naturae Detecta (Delft: H. a Krooneveld, 1695), pp. 334-49.

Related Fellows

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

Associated place

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