Editing 1784 in science (section)

==Chemistry==
* L'Abbé [[René Just Haüy]] states the geometrical law of [[crystallography|crystallization]].<ref>{{cite book|first=René Just|last=Haüy|title=Essai d'une théorie sur la structure des crystaux|location=Paris|publisher=Gogué|year=1784}}</ref>
* [[Antoine Lavoisier]] pioneers [[stoichiometry]].
* [[Citric acid]] is first isolated by [[Carl Wilhelm Scheele]], who crystallizes it from lemon juice.<ref>{{cite journal|last=Scheele|first=Carl Wilhelm|title=Anmärkning om Citron-saft, samt sätt at crystallisera densamma|journal=Kungliga Vetenskaps Academiens Nya Handlingar [New Proceedings of the Royal Academy of Science]|year=1784|volume=5|pages=105–109|url=https://babel.hathitrust.org/cgi/pt?id=mdp.39015009215438;view=1up;seq=115|series=2nd series|trans-title=Note about lemon juice, as well as ways to crystallize it|language=sv}}</ref><ref>{{cite book|last=Graham|first=Thomas|title=Elements of chemistry, including the applications of the science in the arts|url=https://archive.org/details/elementschemist00grahgoog|access-date=2010-06-04|year=1842|publisher=Hippolyte Baillière|location=London|page=[https://archive.org/details/elementschemist00grahgoog/page/n973 944]}}</ref>
* [[Cholesterol]] is isolated.