Black and white photograph of Wilhelm Ostwald (1853-1932) giving a lecture to a filled auditorium.

On the bottom of the picture mat Georg Bredig (1868-1944) has annotated the audience members' names.

Lecturer: Wilhelm Ostwald (1853-1932).

Front row, left to right: Ludwig Knorr (1859 -1921), Ernst Otto Beckmann (1853-1923), Eberth Kid, Gustav Heinrich Wiedemann (1826-1899), Friedrich Ernst Dorn (1848-1916), Dorn Halle, Waentig, Lenkart, Exo. von Leydenwitz, Washsmut, Loein, Jacobus Van't Hoff (1852-1911) Berlin, Paul Emil Flechsig (1847-1929), Reinike, Theodor Wilhelm Engelmann (1843 -1909) Berlin

Second row, left to right: Helene von Reyher (1854–1946), Wislieanus, Rudolf Boehm (Böhm) (1844- 1926) , Theodore Zineke professor of chemistry in the University of Marburg, Credner, Owens, Wilhelm Pfeffer (1845-1920), Arthur von Oettingen (1836-1920), Goldschmidt, Karl Elbs (1858-1933) Giessen, Svante Arrhenius (1859-1927) Stockholm, Richard Abegg (1869-1910), Hans Landolt (1831-1910), Oskar von Miller (1855-1934), Ferdinand von Miller (1842-1929), Max Le Blanc (1865-1943), Höchet

Third Row, left to right: Carl Wilhelm Wagner, Daniel Vorländer (1867 -1941) Halle, Lehenk Marburg , Barton, Wilhelm Wundt (1832-1920), Carl Hermann, Georg Credner (1841-1913), Leskin, Büchner, Böttger, Walther Nernst (1846-1941), Küster, Knoblauch, Ressow, Stobbe, Theodor Paul

Back Window: Robert Thomas Dietrich Luther (1867-1945), Georg Bredig (1868-1944), Waldin Thle, Büttcher, Wiedeburg, Leidfrid, H. Wislirenus, Meiner (Barth), Drude, Smith, Mosch, Lamprecht.