Editing 1849 in science (section)

==Medicine==
* [[January 23]] &ndash; English-born [[Elizabeth Blackwell]] is awarded her M.D. by the Medical Institute of [[Geneva, New York]], becoming the first woman to qualify as a doctor in the [[United States]].
* British [[physician]] Dr. [[Thomas Addison]] first describes [[Addison's disease]] in his ''On the Constitutional and Local Effects of Disease of the Suprarenal Capsules''.
* London physician Dr. [[John Snow (physician)|John Snow]] first publishes his theory that [[cholera]] is a [[contagious disease]] of the [[human gastrointestinal tract]] in his pamphlet ''On the Mode of Communication of Cholera''.<ref>{{cite book|title=The Medical Detective: John Snow and the mystery of cholera|first=Sandra|last=Hempel|location=London|publisher=Granta Books|year=2006|isbn=9781862078420}}</ref>