Biology
- Marcello Malpighi publishes Dissertatio Epistolica de Bombyce in London, a study of Bombyx mori which is the first published monograph on an invertebrate.
- Robert Morison publishes Praeludia Botanica, emphasising use of the structure of a plant's fruits for its classification.
- Francis Willughby and John Ray publish "Experiments concerning the motion of sap in trees, made this spring".
- Jan Swammerdam publishes Historia Insectorum Generalis in the Netherlands, explaining the process of metamorphosis in insects.
Read more about this topic: 1669 In Science
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