1669 in science

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The year 1669 in science and technology involved some significant events.

Astronomy

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".^[1]
Jan Swammerdam publishes Historia Insectorum Generalis in the Netherlands, explaining the process of metamorphosis in insects.

Nicolas Steno puts forward his theory that sedimentary strata had been deposited in former seas, and that fossils are organic in origin.^[3]

Rasmus Bartholin publishes his observation of the birefringence of a light ray by Iceland spar (calcite).^[5]

^ Philosophical Transactions of the Royal Society 4: pp. 963–965.
^ Emsley, John (2001). Nature's Building Blocks: an A–Z guide to the elements. Oxford University Press. ISBN 0-19-50340-7.
^ De solido intra solidum naturaliter contento dissertationis prodromus.
^ Palmer, Alan; Veronica (1992). The Chronology of British History. London: Century Ltd. pp. 190–191. ISBN 0-7126-5616-2.
^ Bartholin, Erasmus (1669). Experimenta crystalli islandici disdiaclastici quibus mira & insolita refractio detegitur. Copenhagen: Daniel Paulli. English translation: Experiments with the double refracting Iceland crystal which led to the discovery of a marvelous and strange refraction tr. by Werner Brandt. Westtown, Pa., 1959.