1813 births

Jean Servais Stas (21 August 1813 – 13 December 1891) was a Belgian analytical chemist who co-discovered the atomic weight of carbon.

Pierre Clément Eugène Pelletan (29 October 1813 – 13 December 1884) was a French writer, journalist and politician.
Born in Royan, Charente-Maritime, Eugène Pelletan was an associate of Lamartine, but refused an appointment to the office in the foreign affairs ministry. Elected deputy in 1863, he joined the opposition to the Second Empire regime. His bright and eloquent speeches won him fame as a brilliant orator. Re-elected in 1869, he protested against the war with Prussia and became a member of the Government of National Defense on 4 September 1870. From 31 January to 4 February 1871, Pelletan exercised the duties of public education minister, but he departed for Bordeaux on 6 February.
Elected to the National Assembly in February 1871, he approved the politics of Thiers and became vice-president of the Senate in 1879. In 1884, he was elected senator for life.
He was the father of Charles Camille Pelletan (1846–1915), French politician and journalist, and also had a daughter Denise Pelletan (d.1902).

Antoine-Joseph Yvon Villarceau (15 January 1813 – 23 December 1883) was a French astronomer, mathematician, and engineer.
He constructed an equatorial meridian-instrument and an isochronometric regulator for the Paris Observatory.
He wrote Mécanique Céleste. Expose des Méthodes de Wronski et Composantes des Forces Perturbatrices suivant les Axes Mobiles (Paris: Gauthier-Villars, 1881) and Sur l'établissement des arches de pont, envisagé au point de vue de la plus grande stabilité (Paris: Imprimerie Impériale, 1853).
He is the eponym of Villarceau circles, which are two circular sections of a torus other than the two trivial ones.
A short street in the 16th arrondissement of Paris is named after Villarceau.

Jean-Gaspard-Félix Laché Ravaisson-Mollien (French: [ʁavɛsɔ̃ mɔljɛ̃]; 23 October 1813 – 18 May 1900) was a French philosopher, 'perhaps France's most influential philosopher in the second half of the nineteenth century'. He was originally and remains more commonly known as Félix Ravaisson.His 'seminal' 'key' work was De l’habitude (1838), translated in English as Of Habit. Ravaisson's philosophy is in the tradition of French Spiritualism, which was initiated by Pierre Maine de Biran (1766–1824) with the essay "The Influence of Habit on the Faculty of Thinking" (1802). However, Ravaisson developed his doctrine as what he called 'spiritualist realism' and 'spiritualist positivism', and – according to Ravaisson scholar Mark Sinclair – can be thought of as founding 'the school of contingency'. His most well known and influential successor was Henri Bergson, with whom the tradition can be seen to end during the 1930s; although the 'lineage' of this 'philosophy of life' can be seen to return in the late twentieth century with Gilles Deleuze. Ravaisson never worked in the French state university system, in his late 20s declining a position at the University of Rennes. In 1838 he was employed as the principle private secretary to the Minister of Public Instruction, going on to secure high-ranking positions such as Inspector General of Libraries, and then the Curator of Classical Antiquities at the Louvre. Later in his life he was appointed as the President of the Jury of the Aggregation of philosophy in France, 'a position of considerable influence'. Ravaisson, was not only a philosopher, classicist, archivist, and educational administrator, but also a painter exhibiting under the name Laché.