Editing 1840 in science (section)

==Events==
* [[William Whewell]] publishes ''The Philosophy of the Inductive Sciences'', introducing the terms ''[[scientist]]'' (for the second time) and ''[[physicist]]''.<ref>{{cite book|first=William|last=Whewell|chapter=Introduction|title=The Philosophy of the Inductive Sciences, founded upon their history|location=London|publisher=J. W. Parker|year=1840|volume=1|pages=113, 71}}</ref><ref>{{cite web|title=scientist, ''n''.|work=[[Oxford English Dictionary]] online version|publisher=Oxford University Press|url=http://www.oed.com/view/Entry/172698|accessdate=2011-12-02|date=September 2011}} {{OEDsub}}</ref><ref>{{cite web|title=physicist, ''n''.|work=Oxford English Dictionary online version|publisher=Oxford University Press|url=http://www.oed.com/view/Entry/143131?redirectedFrom=Physicist#eid|accessdate=2011-12-02|date=September 2011}}</ref>
* [[Justus von Liebig]] publishes ''Die Organische Chemie in ihre Anwendung auf Agricultur und Physiologie'' in [[Braunschweig]], emphasising the importance of agricultural chemistry in crop production; it will go through at least eight editions.<ref>{{cite journal|title=Justus Liebig's Contribution to Agricultural Chemistry|first=George W.|last=Black|journal=[[Journal of Chemical Education]]|year=1978|volume=55|issue=1|page=33|doi=10.1021/ed055p33.1|bibcode=1978JChEd..55...33B}}</ref>
* The first known photograph of [[Niagara Falls]], a [[daguerreotype]], is taken by English chemist [[Hugh Lee Pattinson]].