1915 deaths

Émile Hilaire Amagat (2 January 1841 in Saint-Satur – 15 February 1915) was a French physicist. His doctoral thesis, published in 1872, expanded on the work of Thomas Andrews, and included plots of the isotherms of carbon dioxide at high pressures. Amagat published a paper in 1877 that contradicted the current understanding at the time, concluding that the coefficient of compressibility of fluids decreased with increasing pressure. He continued to publish data on isotherms for a number of different gases between 1879 and 1882, and invented the hydraulic manometer, which was able to withstand up to 3200 atmospheres, as opposed to 400 atmospheres using a glass apparatus. In 1880 he published his law of partial volumes, now known as Amagat's law.
For his studies, he developed many original piezometer devices. His originality went so far as to use the depth of a mine shaft being drilled to reach high pressures of 430 atmospheres in order to study the equations of state of certain gases. His expertise led him to collaborate with the physicist Peter Tait in the development of a piezometer suitable for measuring the compressibility of liquids.Amagat was elected a member of the French Academy of Sciences on 9 June 1902. A unit of number density, amagat, was named after him. He was elected a foreign member of the Royal Society of London in 1897.The French Academy of Sciences gave him the posthumous award of the Prix Jean Reynaud for 1915.

Lucien Millevoye (1 August 1850 – 25 March 1918) was a French journalist and right-wing politician, now best known for his relationship with the Irish revolutionary and muse of W.B. Yeats, Maud Gonne.
Millevoye was born in Grenoble in 1850, the grandson of the poet Charles Hubert Millevoye. He was the editor of La Patrie and a supporter of General Boulanger. He served as Boulangist member for Amiens in the French Chamber of Deputies from 1889 to 1893. He was elected a Nationalist deputy from Paris in 1898 and 1902. In the late 1880s he went to Russia to further the cause of a Franco-Russian alliance. He claimed to be Boulanger's emissary to the Russian Emperor in St Petersburg, a claim Boulanger himself apparently denied. He also supported the Entente Cordiale.During the late 1880s and throughout the 1890s, following his separation from his wife Adrienne, he had a relationship with the Irish activist Maud Gonne which produced two children, Georges Silvère (1890–1891) who died of meningitis, and Iseult Lucille Germaine (1894–1954). Gonne was deeply involved in the Irish independence movement, editing the French language nationalist newspaper L'Irlande Libre in the run-up to the centennial of the 1798 Rebellion. Gonne left Millevoye in the summer of 1900 and returned to Ireland with Iseult.
From 1898 until his death in 1918 Millevoye served as the deputy for Paris, where he died on 25 March 1918.

Alfred Jan Maksymilian Kowalski (Alfred Wierusz-Kowalski; 11 October 1849 – 16 February 1915) was a Polish painter and representative of the Munich School.

Charles René de Paul de Saint-Marceaux (23 September 1845 – 23 April 1915) was a French sculptor.

Luigi Capuana (May 28, 1839 – November 29, 1915) was an Italian author and journalist and one of the most important members of the verist movement (see also verismo (literature)). He was a contemporary of Giovanni Verga, both having been born in the province of Catania within a year of each other. He was also one of the first Italian authors influenced by the works of Émile Zola, French author and creator of naturalism. Capuana also wrote poetry in Sicilian, of which an example appears below.
He was the author of plays (Garibaldi, Vanitas Vanitatum, Parodie, Semiritmi), stories (Studi sulla letteratura contemporanea, Per l'arte, Gli "ismi" contemporanei, Cronache letterarie, Il teatro italiano contemporaneo), novels (Giacinta, Marchese di Roccaverdina, La sfinge, Giovanna Guglicucci: o le pareti del labirinto, Profumo, Rassegnazione) and various other theatrical works.

Armand Peugeot (French: [aʁmɑ̃ pøʒo]; 18 February 1849 – 4 February 1915) was a French industrialist, pioneer of the automobile industry and the man who transformed Peugeot into a manufacturer of bicycles and, later, of automobiles. He was accepted into the Automotive Hall of Fame in 1999.

Theodor Langhans (28 September 1839 – 22 October 1915) was a German pathologist who was a native of Usingen, Duchy of Nassau.
He studied medicine at the University of Heidelberg, and at the University of Göttingen under Friedrich Gustav Jakob Henle (1809–1885), at Berlin under Rudolf Virchow (1821–1902) and in Würzburg, where he became an assistant to Friedrich Daniel von Recklinghausen (1833–1910). In 1867 he became a lecturer at the University of Marburg, and in 1872 became a full professor of pathology at the University of Giessen, where he succeeded Ludwig Franz Alexander Winther (1812–1871).
From 1872 until 1912, Langhans was a professor of pathological anatomy at the University of Bern, where one of his assistants was surgeon Fritz de Quervain (1868–1940). He also worked with Serafina Schachova on kidney anatomy research using a canine model of induced nephritis.Langhans is remembered for his discovery of multi-nucleated giant cells that are found in granulomatous conditions, and are now referred to as Langhans giant cells.

Maarten Maartens, pen name of Jozua Marius Willem van der Poorten Schwartz (15 August 1858 in Amsterdam – 3 August 1915 in Doorn), was a Dutch writer, who wrote in English. He was quite well known at the end of the nineteenth and the beginning of the twentieth century, in both the UK and the US, but he was soon forgotten after his death.

Alois Alzheimer ( ALTS-hy-mər, US also AHLTS-, AWLTS-, German: [ˈaːlɔɪs ˈʔaltshaɪmɐ]; 14 June 1864 – 19 December 1915) was a German psychiatrist and neuropathologist and a colleague of Emil Kraepelin. Alzheimer is credited with identifying the first published case of "presenile dementia", which Kraepelin would later identify as Alzheimer's disease.

Henri Gaudier-Brzeska (né Gaudier; 4 October 1891 – 5 June 1915) was a French artist and sculptor who developed a rough-hewn, primitive style of direct carving.