Address by Ernst Haeckel in the Volkshaus in Jena in 1907

Vortrag Ernst Haeckels (1834–1919) im "Volkshaus" in Jena über die Abstammung des Menschen; Schwarz-Weiß-Photographie, unbekannter Photograph, 1907; Bildquelle: © Ernst-Haeckel-Haus, Jena, http://www.ehh.uni-jena.de/.

Address by Ernst Haeckel (1834–1919) in the Volkshaus in Jena on the origin of humans, black-and-white photograph, unknown photographer, 1907; source: © Ernst-Haeckel-Haus, Jena.