1. Editorial

   • R. Stock
   • B. A. Colenutt

   EditorialNotes Pages: 71 - 71

2. Generalized equations to evaluate the gas hold-up time of chromatographic systems

   • L. S. Ettre

   Originals Pages: 73 - 84

3. The determination of surface polarity of bismuth-molybdenum oxidation catalysts by gas chromatography

   • M. Zdrazil
   • K. F. Scott

   Originals Pages: 85 - 92

4. Relationship between the gas chromatographic behaviour and the molecular structure of hydrocarbon samples and various stationary phases

   • V. M. Nabivach
   • A. V. Kirilenko

   Originals Pages: 93 - 100

5. Ion-exchange chromatography of the product obtained in a reaction of ethylene diamine with urea

   • M. Jaworski

   Originals Pages: 101 - 104

6. Determination of methoxsalen in dosage forms by high-performance liquid chromatography

   • A. H. Hikal
   • A. -R. M. Morad
   • S. El-Houfy

   Originals Pages: 105 - 108

7. Chromatographic investigations of adsorption of some aromatic compounds on aluminium oxide and silica gel from solutions

   • G. Chojnacka
   • J. Ościk
   • J. K. Różyło

   Originals Pages: 109 - 113

8. Thin-layer chromatography of metal ions on bonded stationary phases

   • K. T. Den Bleyker
   • T. R. Sweet

   Originals Pages: 114 - 118

9. Thin-layer chromatography of inorganic lons phosphate on cellulose in acetic acid and in acetic acid-ammonium acetate media

   • T. Shimizu
   • A. Miyazaki
   • I. Saitoh

   Short Communication Pages: 119 - 121

10. Announcements

    Announcement Pages: 122 - 123

11. New products

    Announcement Pages: 126 - 133