image EL_L3_25_Fig
Image number: RS.15788
Credit: ©The Royal Society

Spermatozoa of a ram


25 December 1700


Unknown, Artist

Object type

Archive reference number

Manuscript page number




height (page): 90mm
width (page): 175mm



Seven figues in a letter from Antoni van Leeuwenhoek to Hans Sloane.

Fig. 1: animalcule in the male sperm of a ram
Fig. 2: animalcule in the male sperm of a ram, lying dead
Fig. 3: animalcule in the male sperm of a ram, with a tail slightly more bent
Fig. 4: another animalcule
Fig. 5: another animalcule
Fig. 6: 2 animalcules
Fig. 7: animalcule as Hartsoeker described them, against whom Van Leeuwenhoek wrote this letter.

Object history

The Journal Book mentions on 15 January 1700/1, 'A Letter was read from Mr Leewenhoek of the 25th of December 1700. Containing his Observations on the Animalcula in semime masculo. He was order'd the thanks of the Society' (JBO/10/208).

The images and letter were published in:
A. Leeuwenhoek, ‘Concerning His Further Observations on the Animalcula in Semine Masculino’, Phil. Trans. vol. 23, no. 268 (Jan 1701), pp. 739-46. With seven figures.
A. van Leeuwenhoek, Sevende vervolg der brieven (Delft: H. van Krooneveld, 1702), pp. 295-307.
A. van Leeuwenhoek, Epistolae Ad Societatem Regiam Anglicam (Leiden: J. A. Langerak, 1719), pp. 281-92.

Related Fellows

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

Associated place

<The World>
   > Europe
      > Netherlands