Continuing developments in glass science and technology have necessitated the revision of this successful work, which provides up-to-date coverage of the chemistry of glasses. A thorough treatment of the molecular structure and chemistry of the glassy state is presented in order that the relationsip between properties and function in glasses may be appreciated.

First published in 1954, this volume was intended by its author, A. Paul, to present a complete and consecutive a history of the tribes which inhabit the mountains and deserts of eastern Sudan. The book begins with a description of the Beja tribes and an investigation into their origins, and then traces their long history from roughly 2500 BC to the middle of the twentieth century. Containing numerous maps and illustrations, as well as several detailed appendices, this volume will be of interest to anyone looking for an introduction to the history of the Beja people.

'The preface ... either serves for the explanation of the purpose of the book, or for justification and as an answer to critics'. Lermontov This book is based mainly on the lectures on the Chemistry of Glasses which I gave at the University of Sheffield to the final year honours and postgraduate students of Glass Technology and Materials Science. Most books reflect the interests and enthusiasm of their authors, and the present one is no exception. The chemistry of glass is a rapidly developing field because the frontiers of advanced chemistry and advanced physics are merging together and con-...