A study of the productivity of land in the bishopric of Winchester from 1208–1350. To a student of agrarian society and economy the knowledge of changes in the productivity of land is a crucial factor. For the Middle Ages, only England has the right type of documents - the manorial accounts - to allow cereal yields to be calculated with any degree of exactness. The accounts of the bishopric of Winchester occupy a very special position. This collection not only antedates all others by some 50 years, but is also by far the best series of account rolls in existence and the only one allowing for a study covering the whole of the 13th century. Dr Titow presents the whole range of the Winchester yield calculations and also examines the observable changes in productivity in the light of other relevant factors.