1. ABT-concept

   • R. Stock

   Editorial Pages: 565 - 565

2. Peak symmetry as a measure of column performance in high-performance liquid chromatography

   • R. G. Brownlee
   • J. W. Higgins

   Originals Pages: 567 - 572

3. A simple gas chromatographic-mass spectrometric method for the concurrent determination of novel pentafluoropropionated derivatives of histidine, histamine and their 1-methyl metabolites

   • N. Mahy
   • E. Gelpi

   Originals Pages: 573 - 577

4. Quantitative fluorodensitometric determination of ergot alkaloids

   • M. Prošek
   • E. Kučan
   • A. Medja

   Originals Pages: 578 - 580

5. Dependence of the capacity ratio on mobile phase composition in liquid adsorption chromatography

   • M. Jaroniec
   • J. Narkiewicz
   • M. Borówko

   Originals Pages: 581 - 585

6. Liquid chromatography of cardiac glycosides

   • V. Ya. Davydov
   • A. V. Kiselev
   • Yu. M. Sapojnikov

   Originals Pages: 591 - 595

7. Chromatography of gases on porous polymers of chromosorb and Porapak type

   • T. N. Gvosdovich
   • A. V. Kiselev
   • Ya. I. Yashin

   Originals Pages: 596 - 599

8. Instrumental broadening in gel permeation chromatography

   • R. P. Chaplin
   • W. Ching

   Short Communication Pages: 600 - 601

9. Announcements

   • R. Stock

   Announcement Pages: 602 - 603

10. New products

    Announcement Pages: 604 - 604