1. Commentary

   • James P. Ferris

   ReviewPaper Pages: 513 - 513

2. The search for missing links between self-replicating nucleic ACIDs and the RNA world

   • Kenneth D. James
   • Andrew D. Ellington

   OriginalPaper Pages: 515 - 530

3. Preferential uptake of ammonium ions by zinc ferrocyanide

   • P. S. Braterman
   • G. Arrhenius
   • W. Paplawsky

   OriginalPaper Pages: 531 - 538

4. Enantioselective autocatalysis. III. Configurational and conformational studies on a 1,4-benzodiazepinooxazole derivative

   • Benjamin L. Miller
   • William A. Bonner

   OriginalPaper Pages: 539 - 547

5. The phylogeny of trnas seems to confirm the predictions of the coevolution theory of the origin of the genetic code

   • Massimo Di Giulio

   OriginalPaper Pages: 549 - 564

6. Two types of aminoacyl-trna synthetases could be originally encoded by complementary strands of the same nucleic ACID

   • Sergei N. Rodin
   • Susumu Ohno

   OriginalPaper Pages: 565 - 589