Traveled to England

Date: 
January 1, 1668

Some time during this year, he traveled to England and used a lens to examine the chalk deposits to learn why they are white as well as the clay used in porcelain.

Leeuwenhoek wrote in Letter 6 of September 7, 1674: "Ontrent ses jaer geleden uijt curiusiteit  in Engelant sijnde, ende tot Gravesant, Rochester, etc. siende de groote Krijtbergen, ende  Krijtachtige landen."

The "ontrent" could make it anywhere from mid-1667 when the Peace of Breda made civilian Channel traffic safer to February 1669 when Leeuwenhoek was certified as a surveyor. Given the weather, fall 1667 and summer 1668 are the most likely.

Document: 

Letter 6 of September 7, 1674: “About six years ago, being in England”

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