1. Modularity and the units of evolution

   • Gerhard Schlosser

   OriginalPaper Pages: 1 - 80

2. Ernst Mayr through time on the biological species concept — a conceptual analysis

   • Peter J. Beurton

   OriginalPaper Pages: 81 - 98

3. Comments by Ernst Mayr

   • Ernst Mayr

   ReviewPaper Pages: 99 - 100

4. The development of the critical theory of evolution: The scientific career of Wolfgang F. Gutmann

   • Michael Gudo

   OriginalPaper Pages: 101 - 137