1. On the chemical constitution of cometary nuclei

   • L. Biermann
   • G. Diercksen

   Part V / Early Biochemical Evolution Pages: 297 - 301

2. Photochemical conversions of lower aldehydes in aqueous solutions and in fog

   • T. E. Pavlovskaya
   • T. A. Telegina

   Part V / Early Biochemical Evolution Pages: 303 - 309

3. Inferences from protein and nucleic acid sequences: Early molecular evolution, divergence of kingdoms and rates of change

   • M. O. Dayhoff
   • W. C. Barker
   • P. J. McLaughlin

   Part V / Early Biochemical Evolution Pages: 311 - 330

4. On the possible origin and evolution of the genetic code

   • Thomas H. Jukes

   Part V / Early Biochemical Evolution Pages: 331 - 350

5. Genetics and the origin of the genetic code

   • G. W. R. Walker

   Part V / Early Biochemical Evolution Pages: 351 - 356

6. Origin of the genetic code: A physical-chemical model of primitive codon assignments

   • Joseph Nagyvary
   • Janos H. Fendler

   Part V / Early Biochemical Evolution Pages: 357 - 362

7. The iron-sulphur proteins: Evolution of a ubiquitous protein from model systems to higher organisms

   • D. O. Hall
   • R. Cammack
   • K. K. Rao

   Part V / Early Biochemical Evolution Pages: 363 - 386

8. A new hypothesis for the evolution of biological electron transport

   • Herrick Baltscheffsky

   Part V / Early Biochemical Evolution Pages: 387 - 395

9. Pathways of chemical evolution of photosynthesis

   • A. A. Krasnovsky

   Part V / Early Biochemical Evolution Pages: 397 - 404

10. Inorganic types of fermentation and anaerobic respirations in the evolution of energy-yielding metabolism

    • Fujio Egami

    Part V / Early Biochemical Evolution Pages: 405 - 413

11. Test results on the Viking gas chromatograph-mass spectrometer experiment

    • K. Biemann

    Part VI / Exobiology Pages: 417 - 430

12. Automated life-detection experiments for the Viking mission to Mars

    • Harold P. Klein

    Part VI / Exobiology Pages: 431 - 441

13. Organic contamination problems in the Viking molecular analysis experiment

    • Donald A. Flory
    • John Oró
    • Paul V. Fennessey

    Part VI / Exobiology Pages: 443 - 455

14. Model systems for life processes on Mars

    • M. A. Mitz

    Part VI / Exobiology Pages: 457 - 462

15. An automatically-returned Martian sample by 1985?

    • G. Eglinton
    • S. Tonkin

    Part VI / Exobiology Pages: 463 - 482

16. Life on Jupiter?

    • W. F. Libby

    Part VI / Exobiology Pages: 483 - 486

17. The possibility of organic molecule formation in the Venus atmosphere

    • V. A. Otroshchenko
    • Yu. A. Surkov

    Part VI / Exobiology Pages: 487 - 490

18. Planetary systems and extraterrestrial life

    • Shiv S. Kumar

    Part VI / Exobiology Pages: 491 - 495

19. The origin of life in a cosmic context

    • Carl Sagan

    Part VI / Exobiology Pages: 497 - 505

20. Chemical evolution and the origin of life

    • Martha W. West
    • Elizabeth D. Gill
    • Keith A. Kvenvolden

    Legacy Pages: 507 - 525

21. On the terms ‘biogenesis’ and ‘abiogenesis’

    • Carl Sagan

    BriefCommunication Pages: 529 - 529

22. Book review

    • Richard M. Lemmon

    BookReview Pages: 531 - 531