1. Editorial: Haeckel and modern biology

   • Michael K. Richardson
   • Jonathan E. Jeffery

   EditorialNotes Pages: 247 - 251

2. Erich Wasmann, Ernst Haeckel, and the limits of science

   • A. J. Lustig

   OriginalPaper Pages: 252 - 259

3. Haeckel’s scientific monism as theory of history

   • Daniel Gasman

   OriginalPaper Pages: 260 - 279

4. The former synthesis — Some remarks on the typological background of Haeckel’s ideas about evolution

   • Olaf Breidbach

   OriginalPaper Pages: 280 - 296

5. From Haeckel to event-pairing: the evolution of developmental sequences

   • Olaf R. P. Bininda-Emonds
   • Jonathan E. Jeffery
   • Michael K. Richardson

   OriginalPaper Pages: 297 - 320