| Description | Signed autograph
Examination of the eggs of silkworms; examination of caterpillar's eggs; observations of human's squinting and a theory for its cause; as a note, Leeuwenhoek adds that he has observed roots of barley grain
Original figures no longer exist; engraved figures for publication are attached
Transcribed and translated in 'Alle de brieven van Antoni van Leeuwenhoek', edited, illustrated and annotated by Committee of Dutch Scientists, vol 6, p 311 |
| Place origin | Delft, South Holland, (United Provinces) Netherlands |