1. Editorial

   • Cyril Ponnamperuma

   EditorialNotes Pages: 2 - 2

2. High energy solar radiation and the origin of life

   • John E. Gaustad
   • Stuart N. Vogel

   OriginalPaper Pages: 3 - 8

3. Clay and the origin of life

   • Cyril Ponnamperuma
   • Akira Shimoyama
   • Elaine Friebele

   OriginalPaper Pages: 9 - 40

4. Formation of cyanate and carbamyl phosphate by electric discharges of model primitive gas

   • Yukio Yamagata
   • Tatsuma Mohri

   OriginalPaper Pages: 41 - 44

5. Uracil synthesisvia HCN oligomerization

   • Andries B. Voet
   • Alan W. Schwartz

   OriginalPaper Pages: 45 - 49

6. The radiolysis and racemization of leucine on proton irradiation

   • William A. Bonner
   • Richard M. Lemmon
   • Homer E. Conzett

   OriginalPaper Pages: 51 - 54

7. Polynucleotide replication coupled to protein synthesis: A possible mechanism for the origin of life

   • A. G. Mackinlay

   OriginalPaper Pages: 55 - 69

8. Ambiguity and the evolution of the genetic code

   • R. R. Kocherlakota
   • N. D. Acland

   OriginalPaper Pages: 71 - 80

9. Evolution of major metabolic innovations in the Precambrian

   • John Barnabas
   • Robert M. Schwartz
   • Margaret O. Dayhoff

   OriginalPaper Pages: 81 - 91

10. Chemical evolution and the origin of life

    • Linda G. Pleasant
    • Cyril Ponnamperuma

    Legacy Pages: 93 - 114

11. Book reviews

    • Dennis Goode
    • Mitchell K. Hobish

    BookReview Pages: 119 - 121