M. Loisy has declared [24] that "One can explain to oneself Jesus: one cannot explain to oneself those who invented him." In the previous volume it has been contended that M. Loisy has decisively failed to "explain Jesus" as a possible person: in this we essay to explain "those who invented him." M. Loisy is an illustrious New-Testament scholar: he is not a mythologist or a comparative hierologist. It is very likely that he would find it difficult to explain to himself those who invented Tezcatlipoca; but it would hardly follow that Tezcatlipoca was not invented. In point of fact, a large portion of M. Loisy's own important critical performance consists precisely in explaining away as inventions a multitude of items in the gospel narrative. He can understand invention of many parts, and admits that unless removed they make an incongruous whole. There is really no more difficulty in explaining the other parts as similar inventions than in explaining these. Thus the alleged difficulty is illusory. The occupation of "explaining to oneself" imaginary beings has been the occupation of theologians through whole millenniums. There can still be found even a hierologist or two who believe in the historicity of Krishna; as the judicious Mosheim in the eighteenth century confidently believed in the historicity of Mercury and Mithra. Those--and they are many--who are now content to see myth in the figures of Mithra and Krishna, with or without the nimbus of Sacred Books, may on that score consent to consider the thesis of this volume. It will be no adequate answer to that to say, as will doubtless be said, that the outline of the evolution of the myth is unsatisfying. In the very nature of the case, the connections of the data must be speculative. It may well be that those here attempted--some of them modifications of previous theories--will have to be at various points reshaped; and I invite the reader to weigh carefully the views of Professors Drews and Smith where I diverge from them. The complete establishment of a historical construction will be a long and difficult task. But in its least satisfying aspect the myth-theory is a scientific substitution for what is wholly dissatisfying--the entirely unhistorical construction furnished by the gospels.