NTRODUCTION: The Origin and Purpose of Festivals-Ideas suggested by Christmas-Pagan and Christian Elements-The Names of the Festival-Foundation of the Feast of the Nativity-Its Relation to the Epiphany-December 25 and the Natalis Invicti-The Kalends of January-Yule and Teutonic Festivals-The Church and Pagan Survivals-Two Conflicting Types of Festival-Their Interaction-Plan of the Book.