1904 deaths

Samuel-Alexandre Rousseau (Neuve-Maison, 11 June 1853 - Paris, 1 October 1904) was a French composer.

Eduard von Martens (18 April 1831 – 14 August 1904) also known as Carl or Karl Eduard von Martens, was a German zoologist.Born in Stuttgart in 1831, von Martens attended university in Tübingen, where he graduated in 1855. He then moved to Berlin, where he would be based for the remainder of his career, both at the Zoological Museum of the Berlin University (from 1855) and, from 1859 on, at the Museum für Naturkunde.In 1860, he embarked on the Thetis expedition of the Prussian expedition to Eastern Asia. When the expedition returned to Europe in 1862, von Martens continued to travel around Maritime Southeast Asia for 15 months. He published the results of the "Thetis" expedition in two volumes, constituting the Zoologischer Theil of the "Preussische Expedition nach Ost-Asien." Vol. ii, consisting of 447 pages and 22 plates, contained a very full account of the land molluscs.
Back in Berlin, von Martens was curator of the malacological and other invertebrate sections until his death.Von Martens described 155 new genera (150 of them molluscs) and almost 1,800 species (including around 1,680 molluscs, 39 crustaceans, and 50 echinoderms).
He was a foreign member of the Linnean Society of London, and a corresponding member of the Zoological Society of London.

Christoph von Sigwart (28 March 1830 – 4 August 1904) was a German philosopher and logician. He was the son of philosopher Heinrich Christoph Wilhelm Sigwart (31 August 1789 – 16 November 1844).

Georges Albert Édouard Brutus Gilles de la Tourette (French: [ʒɔʁʒ albɛʁ edwaʁ bʁytys ʒil də la tuʁɛt]; 30 October 1857 – 22 May 1904) was a French neurologist and the namesake of Tourette syndrome, a neurological condition characterized by tics. His main contributions in medicine were in the fields of hypnotism and hysteria.

Jacques Rose Ferdinand Émile Sarrau (Perpignan 24 June 1837 – Saint-Yrieix 10 May 1904) was a French chemist. He worked most of his career at the laboratory in the Dépôt Central des Poudres et Salpêtres (Central Depot for Powder and Saltpetre). He did research on explosive shock waves, the effects of explosives and he developed new explosives. The Mach number was sometimes called in French the Nombre de Sarrau (Sarrau number).

Henri Joseph Anastase Perrotin (December 19, 1845 – February 29, 1904) was a French astronomer and a discoverer of minor planets. Some sources give his middle name as Athanase.
In his early career, he and Guillaume Bigourdan were assistants of Félix Tisserand at Toulouse Observatory. Later, he was the first director of the Nice Observatory in Nice, France from 1884 until his death. He made observations of Mars and attempted to determine the rotation period of Venus. He also calculated perturbations in the orbit of 4 Vesta.In the literature, he is sometimes referred to as Henri Perrotin and sometimes as Joseph Perrotin (this is indeed one and the same person). He is also referenced in H.G Well's novel "The War of The Worlds" as "Perrotin of Nice". His 6 asteroid discoveries are credited by the Minor Planet Center to "J. Perrotin".He won the Prix Lalande in 1875 and 1883. The Martian crater Perrotin and the inner main-belt asteroid 1515 Perrotin were named in his honor.

Cornelis Adriaan Lobry van Troostenburg de Bruyn (1 January 1857 – 23 July 1904) was a chemist from the Netherlands.

Ambroise-Auguste Liébeault (1823–1904) was a French physician and is considered the father of modern hypnotherapy. Ambroise-Auguste Liébeault was born in Favières, a small town in the Lorraine region of France, on September 16, 1823. He completed his medical degree at the University of Strasbourg in 1850, at the age of 26.
He established a medical practice in the village of Pont-Saint-Vincent, near the town of Nancy.
He made many advancements for the field of hypnosis and hypnotherapy, such as co-founding the Nancy School of Hypnosis. The Nancy School — also known as the "Suggestion School", in contrast to the "Hysteria School", also known as the "Paris School", centred on the Salpêtrière Hospital — was oriented to a suggestion-centred approach to hypnosis in contrast to the previously used hysteria-centred approach promoted at the Salpêtrière Hospital. By contrast to the "Paris School", the main, fundamental belief of the "Nancy School" was that hypnosis was a normal phenomenon and not a consequence of a pathology analogous to hysteria.
Liébeault published several books on his theories, techniques, and results in working with hypnosis. On February 18, 1904, he died in Nancy, leaving behind a strong legacy and influence on the still developing field of hypnosis and hypnotherapy.

Karl Koester (born 2 April 1843 in Bad Dürkheim, died 2 December 1904 in Bonn) was a German pathologist and rector of the University of Bonn from 1898 to 1899. He was professor of pathology and director of the Institute of Pathology at the University of Bonn from 1874 to 1904. He held the title Geheimer Medizinalrat.
Koester studied medicine in Munich, Tübingen and Würzburg, and obtained his doctoral degree in Würzburg in 1867. His doctoral advisor and mentor was Friedrich Daniel von Recklinghausen, and he subsequently worked as Recklinghausen's assistant. From 1873 to 1874 he was professor of general medical pathology and anatomical pathology at the University of Giessen. He succeeded Eduard von Rindfleisch as professor of pathology at the University of Bonn in 1874.
In 1868 he published Ueber die feinere Structur der menschlichen Nabelschnur ("On the finer structure of the human umbilical cord").He became a member of the German National Academy of Sciences Leopoldina in 1880.

Friedrich Jolly (24 November 1844 – 4 January 1904) was a German neurologist and psychiatrist who was a native of Heidelberg, and the son of physicist Philipp von Jolly (1809–1884).
He studied medicine at Göttingen under Georg Meissner (1829–1905), and in 1867 received his doctorate at Munich. In 1868 he became an assistant to Bernhard von Gudden (1824–1886) and Hubert von Grashey (1839–1914) at the mental institution in Werneck, and in 1870 was an assistant to Franz von Rinecker (1811–1883) at the Juliusspital in Würzburg.
In 1873 Jolly became director of the psychiatric clinic in Strassburg, where he was named as successor to Richard von Krafft-Ebing (1840–1902). In 1890 he succeeded Karl Friedrich Otto Westphal (1833–1890) as director of the neuropsychiatric clinic at the Berlin Charité.
Jolly is remembered for his pioneer research of myasthenia gravis, including the electrophysiological aspects involving abnormal fatigue associated with the disease which forms the basis of Jolly's test. He is credited with coining the term myasthenia gravis pseudoparalytica for the disorder.
He was the author of an influential treatise on hypochondria that was published in Hugo Wilhelm von Ziemssen's "Handbuch der speciellen Pathologie und Therapie". His "Untersuchungen über den elektrischen Leitungswiderstand des menschlichen Körpers" (1884) was fundamental to the study of electrical diagnostics.His grave is preserved in the Protestant Friedhof III der Jerusalems- und Neuen Kirchengemeinde (Cemetery No. III of the congregations of Jerusalem's Church and New Church) in Berlin-Kreuzberg, south of Hallesches Tor.