In this volume the writer has taken for his special theme the words used by Saint Paul in his sermon on Mars Hill, The Unknown God, words which the great Apostle applied also to the spiritual Zeus of the ancient Greeks. The effort of the writer is to show the ancient belief of mankind in the Unknown God, and that the great Father of all has granted his inspirations to many of very different countries and tribes and races. This volume is in some respects a search for the footprints of the Divine Being on the shifting sands of remote history. The first chapters deal with the Hamitic and Semitic races. Fortunately the latest investigations in the early inscriptions of Egypt Show that there was a period (not the earliest) in which a profound belief in the One God existed in the minds of the scholars and priests of that ancient country. From this field the student is con ducted to the Semitic tribes in the valley of the Euphrates.