A History and an Appreciation this does for the British group what Serge Lifar's recent A History of Russian Ballet (Roy, p. 567) did for the Ballets Russes. Deeply probing in her analysis of what has happened since the Sadler's Wells architects, (Ninette de Valois, Frederick Ashton and Constant Lambert) planned the future Mary Clarke spends ample space discussing the music, the choreography, the settings and the combination of techniques whose development could finally prove the group mature. In preparation for the modern methods there is clear reference to historical background, the influence of Diaghileff and the steps taken towards a truly British Ballet. Once operations were in full swing, there were new comers and their own valuable contributions, especially Robert Helpmann, Alicia Markova and Anton Dolin and Shearer and Fonteyn as prima ballerinas today. There is a careful look-too-at the many ballets which have originated with the Sadler's Wells and which have been exported with ever increasing welcome. A tribute and a worthy examination.