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1840 in science
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==Earth sciences== * [[Louis Agassiz]] publishes his ''Etudes sur les glaciers'', the first major scientific work to propose that the Earth has seen an [[ice age]]. * [[Roderick Murchison]] identifies [[Devonian]] stratigraphy in Russia, ending [[the Great Devonian Controversy]].<ref>{{cite book|authorlink=Martin J. S. Rudwick|last=Rudwick|first=Martin J. S.|title=The Great Devonian Controversy: The Shaping of Scientific Knowledge among Gentlemanly Specialists|publisher=University of Chicago Press|year=1985}}</ref>
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