In order that the book may serve as a guide to students, the names of those to whose researches our present knowledge of the subject is due have frequently been introduced, and it will be found, I trust, that I have been fair to all.[2] At the same time, I have naturally not hesitated to indicate my dissent from views advanced by this or that scholar, and it will also be found, I trust, that in the course of my studies I have advanced the interpretation of the general theme or of specific facts at various points. While, therefore, the book is only in a secondary degree sent forth as an original contribution, the discussion of mooted points will enhance its value, I hope, for the specialist, as well as for the general reader and student for whom, in the first place, the volumes of this series are intended. The disposition of the subject requires a word of explanation. After the two introductory chapters (common to all the volumes of the series) I have taken up the pantheon as the natural means to a survey of the field. The pantheon is treated, on the basis of the historical texts, in four sections: (1) the old Babylonian period, (2) the middle period, or the pantheon in the days of Hammurabi, (3) the Assyrian pantheon, and (4) the latest or neo-Babylonian period. The most difficult phase has naturally been the old Babylonian pantheon. Much is uncertain here. Not to speak of the chronology which is still to a large extent guesswork, the identification of many of the gods occurring in the oldest inscriptions, with their later equivalents, must be postponed till future discoveries shall have cleared away the many obstacles which beset the path of the scholar. The discoveries at Telloh and Nippur have occasioned a recasting of our views, but new problems have arisen as rapidly as old ones have been solved. I have been especially careful in this section not to pass beyond the range of what is definitely _known_, or, at the most, what may be regarded as tolerably certain. Throughout the chapters on the pantheon, I have endeavored to preserve the attitude of being 'open to conviction'--an attitude on which at present too much stress can hardly be laid. The second division of the subject is represented by the religious literature. With this literature as a guide, the views held by the Babylonians and Assyrians regarding magic and oracles, regarding the relationship to the gods, the creation of the world, and the views of life after death have been illustrated by copious translations, together with discussions of the specimens chosen. The translations, I may add, have been made direct from the original texts, and aim to be as literal as is consonant with presentation in idiomatic English. The religious architecture, the history of the temples, and the cult form the subject of the third division. Here again there is much which is still uncertain, and this uncertainty accounts for the unequal subdivisions of the theme which will not escape the reader.