Chromatography has become the premier technique for separations and analysis. The three most important types are gas chromatography, liquid chromatography and thin-layer chromatography. These share a common theoretical base, and the most efficient education of a novice would be a unified study. This book presents a unified approach to chromatography and emphasizes the similarities and differences between the major divisions - gas chromatography, liquid chromatography and thermal liquid chromatography. It is an elementary introduction to the topic, but a comprehensive one. It includes many practical operating hints, and references are provided for further information. The book should serve the needs of the scientist new to the field as well as providing a reference for those already working in it.