Constantijn Huygens wrote to Oldenburg about Leeuwenhoek, a "painstaking man" who should be "cherished"

January 26, 1677

At the end of a long letter to Oldenburg, Huygens wrote (translation from the French from Correspondence of Henry Oldenburg):

I beg you to let me now how your Society takes to the little worms in pepper-water of Leeuwenhoek, and also his anatomy of ice, and its eggs which he deals with like a midwife. This painstaking man may produce many more unknown things, and should be cherished.