Sets the origin of musical mensuration and proportion signs in the context of other measuring systems of the 14th century. This book also traces the evolution of the mensural notational system to the threshold of the modern system of notation. one of its greatest strengths is her concentration on a fixed and well-defined body of material. Painstaking and wide-ranging work such as Berger's, grounded in the dialogue of theorists, helps us both to understand their ideas and concerns and to approach the musical sources of their eras with better questions to pose.