Leeuwenhoek, Antoni Van Three-quarter length seated portrait of Antoni van Leeuwenhoek holding one of his microscopes in his left hand. He is shown wearing a long robe with a shirt and cravat. A globe, quill pen, leafy branch and diagram can be seen on his desk. The mezzotint is accompanied by a short poem written in Dutch by Constantijn Huygens that explains how Leeuwenhoek used his microscope like glass keys to unlock the secrets of the natural world. 1686