Duns Scotus, along with Thomas Aquinas and William of Ockham, was one of the three most talented and influential of the medieval schoolmen, and a highly original and creative thinker. This book contains detailed discussion and analysis of Scotus's accounts of the nature of matter, the structure of material substance, mass, the nature of space, time, and motion, quantitative and qualitative change, and the various sorts of unity which can be exhibited by different kinds of whole.