Liquid crystal science underlies the technology of about half the current display technology by value, an industry now worth some $10 billion per annum worldwide. The fundamental science straddles the disciplines of chemistry, physics, engineering, mathematics and computer science. Among liquid crystal scientists today there is much interest in the historical process that has brought the subject to its present level. The historical roots lie in the years following 1888, again in the interwar years, and finally in the late 60s and 70s. This book has collected important papers in the development of liquid crystal science into one reference volume. The collection is divided into sections, each of which is prefaced by a brief commentary, referring to the historic-scientific context of the time. Some of these papers are available for the first time in English.More modern papers carry a short commentary from the original author, offering recollections of the context in which the work was carried out and what its impact has been. "Crystals that Flow" is aimed at liquid crystal scientists- from whatever background - physics, mathematics, chemistry, engineering or computer science. Historians of science will also find this a useful reference.