The present volume constitutes the Proceedings of the Symposium on Thin-Layer Chromatography (Rome, 2-3 May, 1963) organized by Istituto Superiore di Sanità and contains: Preface; Introductory speech [by G. Giacomello - Rome]; Development and application of thin-layer chromatography [by E. Stahl - Saarbrücken]; Dünnschichtchromatographie auf Cellulose-Schichten [von P. Wollenweber - Düren]; Thin-layer chromatography on loose layers of alumina [by L. Lábler - Praha]; La chromatographie sur couches minces dans le domaine des substances odorantes naturelles et synthétiques [par E. Demole - Genève]; Thin-layer electrophoresis [by G. Grassini - Rome]; Spectrométrie de fiasse et chromatographie en couche mince [par M. Fétizon - Gif-sur-Yvette]; Thin-layer chromatography of steroids [by R. Neher - Basel]; Thin-layer chromatography of lipids [by F. B. Padley - St. Andrews]; Standardized chromatographic data: a suggestion [by M. Brenner, G. Pataki and A. Niederwieser - Basel]; Chromatography on thin layer of starch with reversed phases [by J. Davídek - Praha]; Centrifugal chromatography - XII - Centrifugal thin-layer chromatography [by J. Rosmus, M. Pavlicek and Z. Deyl - Praha]; Über die Anwendung der Zirkulartechnik beiro chromatographieren auf Kieselgel-Dünnschichten Trennung und Reindarstellung vou Morphin, Papaverin und Chinin aus deren Gemischen [von M. von Schantz - Helsingfors]; Zur Dünnschichtchromatographie mehrkerniger aromatischer Kohlenwasserstoffe [von H.-J. Petrowitz - Berlin-Dahlem]; Thin-layer chromatography of 2,4-dinitrophenylhydrazones of aliphatic carbonyl compounds and their quantitative determination [by G. M. Nano - Torino]; Thin-layer chromatography of steroidal bases and Holarrhena alkaloids [by L. Lábler and V. Cerny - Praha];Thin-layer chromatography of alkaloids on magnesia chromatoplates [by E. Ragazzi, G. Veronese and C. Giacobazzi - Padua]; Some applications of thin-layer chromatography for the separation of alkaloids [by G. Grandolini, C. Galeffi, E. Montalvo, C. G. Casinovi and G. B. Marini-Bettòlo - Rome];Thin-layer chromatography of isomeric oximes. II. [by I. Pejkovic-Tadic, M. Hranisavljevic-Jakovljevic and S. Nesic - Belgrade]; The adaptation of the technique of thin-layer chromatography to aminoaciduria investigation [by J. Opienska-Blauth, H. Kraczkowsky and H. Brsuszkiewicz - Lublin];Direct analysis of phospholipids of mitochondria and tissue sections by thin-layer chromatography [by S. B. Curri, C. R. Rossi and L. Sartorelli - Padova]; Qualitative and quantitative analysis of natural and synthetic corticosteroids by thin-layer chromatography [by G. Cavina and C.Vicari - Rome]; Thin-layer chromatography and the detection of stilboestrol [by C. Bonino - Bologna]; The analysis of mixtures of animal and vegetable fats - IV - Separation of sterol acetates by reversed-phase thin-layer chromatography [by J. W. Copius Peereboom - Leiden]; Applications of thin-layer chromatography on Sephadex to the study of proteins [by P. Fasella, A. Giartosio and C. Turano - Rome]; Thin-layer chromatography on silica gel of food colours [by M. A. Ciasca and C. G. Casinovi - Rome]; The application of thin-layer chromatography to investigations of antifermentatives in foodstuffs [by M. Covello and O. Schettino Naples]; Direkte quantitative Bestimmung von Kationen mittels Dünnschichtchromatographie [von H. Seiler - Basel]; Thin-layer chromatography of inorganic ions – I - Separation of metal dithizonates [by M. Hranisavljevic-Jakovljevic, L. Pejkovic-Tadic - Belgrade - and K. Jakovljevic Slovenia].