James Gregory demonstrates the transcendence of π.[2]
Physiology and medicine
June 15 – Jean-Baptiste Denys performs the first blood transfusion from a lamb into a boy.
Robert Hooke demonstrates that the alteration of the blood in the lungs is essential for respiration.
Thomas Willis publishes Pathologicae Cerebri, et nervosi generis specimen.
Publications
Elementorum myologiae specimen, 1669
Nicolas Steno publishes Elementorum Myologiae Specimen, seu Musculi Descriptio Geometrica. Cui accedunt canis carchariae dissectum caput, et dissectus piscis ex canum genere in Florence, providing a foundation for the study of muscle mechanics, the ovary (based on his dissection of dogfish), and the sedimentary theory of geology.[3]
^Richardson, Matthew (2001). The Penguin Book of Firsts. New Delhi: Penguin Books India. p. 184. ISBN 0-14-302771-9.
^Garboe, Axel (1954). Nicolaus Steno (Niels Stensen) and Erasmus Bartholinus: two 17th century Danish scientists and the foundation of exact geology and crystallography. Copenhagen: Reitzel.
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