1. Authors Beware!

   • L. S. Ettre

   Editorial Pages: 557 - 557

2. Liquid chromatography with and of platinum complexes

   • J. Köhler
   • G. Schomburg

   Originals Pages: 559 - 566

3. Konzentrationsabhängigkeit der Retentionsdaten von Alkoholen in der Gas-Flüssig-Verteilungs-Chromatographie (GLC)

   • W. Ecknig
   • Th. Kleinert
   • A. N. Korol

   Originals Pages: 567 - 575

4. The obstruction factor γ in gas chromatography

   • P. Thumneum
   • S. Hawkes

   Originals Pages: 576 - 578

5. Gas chromatographic analysis of phenylurea herbicides following catalytic hydrolysis on silica gel

   • A. de Kok
   • I. M. Roorda
   • U. A. Th. Brinkman

   Originals Pages: 579 - 586

6. Determination of pindolol in pharmaceutical formulations by gas chromatography

   • M. S. Tawakkol
   • M. E. Mohamed
   • H. Y. Aboul-Enein

   Originals Pages: 587 - 588

7. Role of the organic solvent modifier in the reversed phase high-performance liquid chromatography of polypeptides

   • B. Grego
   • M. T. W. Hearn

   Originals Pages: 589 - 592

8. Optimization of the visualization of thin-layer chromatograms by charring

   • P. F. Kikolski
   • J. Szymanowski

   Originals Pages: 593 - 595

9. Correlations between Van der Waals' volume and retention index general equation applicable to different homologous series

   • F. Saura Calixto
   • A. García Raso

   Originals Pages: 596 - 598

10. Thin-layer chromatography of hydroxyanthraquinones in plant extracts

    • P. P. Rai
    • M. Shok

    Short Communications Pages: 599 - 600

11. Gas chromatographic separation of ethanolamines and ethylene glycols without preliminary derivatization

    • S. Boneva
    • N. Dimov

    Short Communications Pages: 601 - 602

12. Theory and mathematics of chromatography

    • G. Guiochon

    Book Review Pages: 602 - 602

13. The 1981 M.S. Tswett chromatography awards

    Announcement Pages: 603 - 603

14. Announcements

    Announcement Pages: 604 - 604

15. New products

    Announcement Pages: 604 - 613