This is the second volume of Professor Macmurray's Gifford Lectures on The Form of the Personal. The first volume, The Self as Agent, was concerned to shift the center of philosophy from thought to action. Persons in Relation, starting from this practical standpoint, sets out to show that the form of personal life is determined by the mutuality of personal relationship, so that the unit of human life is not the I alone, by the You and I.