1. The cladistic solution to the species problem

   • Mark Ridley

   OriginalPaper Pages: 1 - 16

2. Obligation and the new naturalism

   • Roger D. Masters

   OriginalPaper Pages: 17 - 32

3. Where guesses come from: Evolutionary epistemology and the anomaly of guided variation

   • Edward Stein
   • Peter Lipton

   OriginalPaper Pages: 33 - 56

4. The rise of a microparadigm in oncology

   • Paolo Vezzoni
   • Maria Rosa Pozzi
   • Anna Villa

   OriginalPaper Pages: 57 - 67

5. A defense of David Kitts

   • Marjorie Grene

   Discussions Pages: 69 - 72

6. Sex and the individuality of species: A reply to Mishler and Brandon

   • Michael T. Ghiselin

   Discussions Pages: 73 - 76

7. Sex and the individuality of species: A response to Ghiselin

   • Brent D. Mishler
   • Robert N. Brandon

   Discussions Pages: 77 - 79

8. Sociobiology and the justification of political action: A commentary on Bo Shu

   • Gary McCarron

   Discussions Pages: 81 - 84

9. Science or ideology? A response to Gary McCarron

   • Zhang Bo Shu

   Discussions Pages: 85 - 88

10. Where's the species? Comments on the phylogenetic species concepts

    • Marc Ereshefsky

    Discussions Pages: 89 - 96

11. Having fun with ETI

    • Ernan McMullin

    Reviews Pages: 97 - 105

12. Contemporary feminist perspectives on biological science

    • John Dupré

    Reviews Pages: 107 - 119

13. Booknotes

    Legacy Pages: 121 - 127

14. 12th Annual spring systematics symposium

    Announcement Pages: i - ii