Title: Carl Vogt, Jacob Moleschott, Ludwig Büchner, Ernst Haeckel
Subjects: Correspondence, Physicians, Science, Philosophy, Collected Correspondence, Biography
Places: Germany
People: Ludwig Büchner (1824-1899), Jacob Moleschott (1822-1893), Karl Christoph Vogt (1817-1895), Ernst Heinrich Philipp August Haeckel (1834-1919)