Otto Haeckel

Washing-up at a juvenile summer holiday camp, Germany Otto Haeckel

Erich Heckel and Otto Mueller playing Chess, 1913 Anonymous

Prof. Haeckel Ernst Haeckel

Algae. Diatomea Ernst Haeckel

Fish. Teleostei Ernst Haeckel

Otto Lilienthal makes one of his last flights Anonymous

Octopuses. Gamochonia Ernst Haeckel

Moths. Tineida Ernst Haeckel

Glass sponges. Hexactinellae Ernst Haeckel

Starfish and details of starfish anatomy. Ophiodea Ernst Haeckel

Microorganisms. Peridinea Ernst Haeckel

Microorganisms. Phaeodaria Ernst Haeckel

Microorganisms. Flagellata Ernst Haeckel

Algae in the genus Pediastrum. Melethallia Ernst Haeckel

Corals. Hexacoralla Ernst Haeckel

Microorganisms. Thalamophora Ernst Haeckel

Otto Lilienthal, German aeronaut, early 20th century Unknown

Microorganisms. Thalamophora Ernst Haeckel

Aquatic animals. Acanthophracta Ernst Haeckel

Otto von Bismarck Carl Ludwig Friedrich Becker

Microorganisms. Rotatoria Ernst Haeckel

Otto von Guericke, German inventor, engineer and physicist, 1672 Unknown

Marine animals. Acanthometra Ernst Haeckel

Algae. Diatomea Ernst Haeckel

Algae. Diatomea Ernst Haeckel

Algae. Diatomea Ernst Haeckel

Boxfishes. Ostraciontes Ernst Haeckel

Algae. Fucoideae Ernst Haeckel

Otto Salzer, 1905(?) Unknown

Microorganisms. Peridinea Ernst Haeckel

Illustration of mollusk. Acephala Ernst Haeckel

Corals. Tetracoralla Ernst Haeckel

Starfish and details of starfish anatomy. Ophiodea Ernst Haeckel

Ferns. Filicinae Ernst Haeckel

Marine animals. Acanthometra Ernst Haeckel

Portrait of Otto von Bismark Anonymous