In a former volume, “The Blood Covenant,” I sought to show the origin of sacrifice, and the significance of transferred or proffered blood or life. The facts given in that work have been widely accepted as lying at the basis of fundamental doctrines declared in the Hebrew and Christian Scriptures, and have also been recognized as the source of perverted views which have had prominence in the principal ethnic religions of the world. Scholars of as divergent schools of thought as Professors William Henry Green of Princeton, Charles A. Briggs of New York, George E. Day of Yale, John A. Broadus of Louisville, Samuel Ives Curtiss of Chicago, President Mark Hopkins of Williams, Rev. Drs. Alfred Edersheim of Oxford and Cunningham Geikie of Bournemouth, Professor Fréderic Godet of Neuchatel, and many others, were agreed in recognizing the freshness and importance of its investigations, and the value of its conclusions. Professor W. Robertson Smith, of Cambridge, in thanking me for that work, expressed regret that he had not seen it before writing his “Kinship and Marriage in Early Arabia.” He afterwards made repeated mention of the work as an authority in its field, in his Burnett Lectures on the “Religion of the Semites.” This volume grew out of that one. It looks back to a still earlier date. That began as it were with Cain and Abel, while this begins with Adam and Eve. It was while preparing a Supplement for a second edition of that volume that the main idea of this work assumed such importance in my mind that I was led to make a separate study of it, and present it independently. The special theory here advanced is wholly a result of induction. The theory came out of the gathered facts, instead of the facts being gathered in support of the theory. Of course, these facts are not new, but it is believed that their synthetic arrangement is. It has been a favorite method with students of primitive religions to point out widely different objects of primitive worship and their corresponding cults among different peoples, and then to try to show how the ceremonials of the Hebrew and Christian Scriptures were made up from these primitive cults. But the course of investigation here pursued seems to show that the earlier cult was the simple one, which has been developed in the line of the Bible story, and that the other cults, even those baser and more degraded, are only natural perversions of the original simple one. This is a reversal of the usual order in studies of primitive religious rites. Here it is first the simple, then the complex; first the one germ, then the many varieties of growth from that germ.