This habit of viewing Greek religion exclusively through the medium of Greek literature has brought with it an initial and fundamental error in method—an error which in England, where scholarship is mainly literary, is likely to die hard. For literature Homer is the beginning, though every scholar is aware that he is nowise primitive; for theology, or—if we prefer so to call it—mythology, Homer presents, not a starting-point, but a culmination, a complete achievement, an almost mechanical accomplishment, with scarcely a hint of _origines_, an accomplishment moreover, which is essentially literary rather than religious, sceptical and moribund already in its very perfection. The Olympians of Homer are no more primitive than his hexameters. Beneath this splendid surface lies a stratum of religious conceptions, ideas of evil, of purification, of atonement, ignored or suppressed by Homer, but reappearing in later poets and notably in Aeschylus. It is this substratum of religious conceptions, at once more primitive and more permanent, that I am concerned to investigate. Had ritual received its due share of attention, it had not remained so long neglected. I would guard against misapprehension. Literature as a starting-point for investigation, and especially the poems of Homer, I am compelled to disallow; yet literature is really my goal. I have tried to understand primitive rites, not from love of their archaism, nor yet wholly from a single-minded devotion to science, but with the definite hope that I might come to a better understanding of some forms of Greek poetry. Religious convention compelled the tragic poets to draw their plots from traditional mythology, from stories whose religious content and motive were already in Homer’s days obsolete. A knowledge of, a certain sympathy with, the _milieu_ of this primitive material is one step to the realization of its final form in tragedy. It is then in the temple of literature, if but as a hewer of wood and drawer of water, that I still hope to serve. As the evidence to be set before the reader is necessarily somewhat complex in detail, and the arguments of the successive chapters closely interdependent, it may be well at the outset to state, as simply as may be, the conclusions at which I have arrived, and to summarize briefly the steps of the discussion. * * * * *