Events relating to evolution
The Partisan, set in South Carolina, launches the series of novels by William Gilmore Simms known as the Revolutionary Romances
An uprising in Sicily in January starts off Europe's 'year of revolutions'
A revolution in Paris in February removes Louis-Philippe and introduces France's second republic
Metternich and his family leave Vienna, in this year of revolutions, and live in Trumpeters' House until October 1849
Expelled from Germany after the year of revolutions, Marx makes his home in tolerant London
Russian novelist Fyodor Dostoevsky undergoes a mock execution, after being sentenced to death for revolutionary activities against tsar Nicholas I
Fyodor Dostoevsky begins four years of hard labour in Siberia for revolutionary activities
The Russian revolutionary and exile Alexander Herzen spends much of this year in St Helena Terrace before moving to Twickenham
Austrian monk Gregor Mendel begins his study of pea plants in the garden of the Abbey of St Thomas in Brno
Charles Darwin is alarmed to receive in his morning post a paper by Alfred Russell Wallace, outlining very much his own theory of evolution
Charles Darwin puts forward the theory of evolution in On the Origin of Species, the result of twenty years' research
Charles Dickens publishes his French Revolution novel, A Tale of Two Cities
Longfellow's narrative poem Paul Revere's Ride dramatizes a turning point at the start of the American Revolution
Gregor Mendel reads a paper to the Natural History Society in Brno describing his discoveries in the field of genetics

Whistler begins to paint his Nocturnes, a revolutionary series of night-time images on the river Thames
A secret revolutionary group (Union and Progress, later known as the Young Turks) is formed in Salonika in the Ottoman empire
German physicist Max Planck proposes the revolutionary concept of the quantum theory
In his pamphlet What is to be done? Lenin argues for early action to promote revolution
Joseph Conrad publishes his novel Nostromo, about a revolution in South America and a fatal horde of silver
A revolution begins in Mexico that will last ten years before being resolved
A republican revolution in Portugal deposes Manuel II, bringing to an end the Braganza dynasty and the Portuguese monarchy
Emiliano Zapata leads peasant groups in the Mexican revolution, under the slogan 'Land and Liberty'
An uprising in the city of Wuchang is the first major event in the rapidly developing Chinese revolution
Benito Mussolini, an active revolutionary Socialist, becomes editor of the party newspaper in Italy
A mutiny by soldiers, in support of Petrograd demonstrators, proves a turning point in Russia's February revolution