Editing 1691 in science

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The year '''1691 in [[science]]''' and [[technology]] involved some significant events.

==Biology==
* Italian Jesuit scholar [[Filippo Bonanni]] publishes the results of his microscopic observations of invertebrates in ''Observationes circa Viventia, quae in Rebus non-Viventibus''.

==Mathematics==
* [[Gottfried Leibniz]] discovers the technique of [[separation of variables]] for ordinary [[differential equations]].
* [[Michel Rolle]] invents [[Rolle's theorem]].

==Medicine==
* Anton Nuck's ''Adenographia curiosa et uteri foeminei anatome nova'' is published at [[Leiden]], including a description of the [[canal of Nuck]]<ref>{{cite web|first=Ole Daniel|last=Enersen|title=Nuck's canal|url=http://www.whonamedit.com/synd.cfm/2644.html|work=[[Who Named It?|Whonamedit?]]|accessdate=2012-10-15}}</ref> and a demonstration that the [[embryo]] is derived from the [[ovary]] and not the [[sperm]].<ref>{{cite book|last=Speert|first=Harold|title=Obstetric and Gynecologic Milestones|publisher=Macmillan|location=New York|year=1958|pages=95–101}}</ref>

==Technology==
* [[Edmond Halley]] devises a [[diving bell]].<ref>{{cite journal|author1=Edmonds, Carl|author2=Lowry, C.|author3=Pennefather, John|title=History of diving|journal=[[South Pacific Underwater Medicine Society]] Journal|volume=5|issue=2|url=http://archive.rubicon-foundation.org/5894|accessdate=2011-06-17|archive-date=2010-10-14|archive-url=https://web.archive.org/web/20101014013941/http://archive.rubicon-foundation.org/5894|url-status=dead}}</ref>
* In music, the "equal temperament scale" used in modern music is developed by [[organist]] [[Andreas Werckmeister]].

==Births==
* November 18 – [[Mårten Triewald]], [[Sweden|Swedish]] [[mechanical engineer]] (died [[1747 in science|1747]])

==Deaths==
* January 17 – [[Richard Lower (physician)|Richard Lower]], [[English people|English]] [[physician]] who performed the first direct [[blood transfusion]] (born [[1631 in science|1631]])
* December 31 – [[Robert Boyle]], Anglo-Irish [[chemist]] (born [[1627 in science|1627]])<ref>{{cite web |title=Robert Boyle {{!}} Biography, Contributions, Works, & Facts |url=https://www.britannica.com/biography/Robert-Boyle |website=Encyclopedia Britannica |access-date=4 December 2020 |language=en}}</ref>

==References==
{{reflist}}

[[Category:1691 in science| ]]
[[Category:17th century in science]]
[[Category:1690s in science]]