On starting to write the preface it occured to the editors that it might be a good idea to incorporate so me organizational thoughts. First of all, why have. we organized this book on -Glycoprotein storage diseases," an unfamiliar area of pathology unlikely to be encountered in practice? In preparing such a volume we considered that in the past ten years there has been a large amount of intensive research activity on glycoproteinoses and no detailed review has been entirely devoted to this subject. This research has led to new information about hereditary mental retardation and progressive...