1. Editorial note

   • C. de Jager

   EditorialNotes Pages: 619 - 620

2. The carbonaceous chondrites

   • Brian Mason

   OriginalPaper Pages: 621 - 646

3. Organic constituents of the carbonaceous chondrites

   • Michael H. Briggs
   • Gregg Mamikunian

   OriginalPaper Pages: 647 - 682

4. Ionospheric research from space vehicles

   • R. E. Bourdeau

   OriginalPaper Pages: 683 - 728

5. On the interaction between a spacecraft and an ionized medium

   OriginalPaper Pages: 719 - 728

6. Le spectre ultraviolet des etoiles

   • Jean-Claude Pecker

   OriginalPaper Pages: 729 - 748

7. Concerning the interpretation of the ultraviolet radiation from B stars

   • Anne B. Underhill

   OriginalPaper Pages: 749 - 761

8. Report on the scientific interest and problems

   • P. Swings

   OriginalPaper Pages: 762 - 773

9. La gamma astronomie

   • E. Schatzman

   OriginalPaper Pages: 774 - 780

10. Some technical possibilities for astronomical satellites

    • A. W. Lines

    OriginalPaper Pages: 781 - 785