| Description | Signed autograph
Observations of skin inside Leeuwenhoek's mouth and about his eczema, which he believed sudorifics could cure; observations of a child with a skin disease which causes the skin to become scaly (ichthyosis); observations of the intestines where Leeuwenhoek identifies blood vessels and lymph vessels; the effects of vinegar; experiment to demonstrate the adsorption of food nutrients in the intestines; an account of the intestinal wall and peristalsis
Original figures now no longer exist
Transcribed and translated in 'Alle de brieven van Antoni van Leeuwenhoek', edited, illustrated and annotated by Committee of Dutch Scientists, vol 4, p 167 |
| Place origin | Delft, South Holland, (United Provinces) Netherlands |