A justification is perhaps needed of the length at which I have dwelt upon the popular festivals observed by European peasants in spring, at midsummer, and at harvest. It can hardly be too often repeated, since it is not yet generally recognised, that in spite of their fragmentary character the popular superstitions and customs of the peasantry are by far the fullest and most trustworthy evidence we possess as to the primitive religion of the Aryans. Indeed the primitive Aryan, in all that regards his mental fibre and texture, is not extinct. He is amongst us to this day. The great intellectual and moral forces which have revolutionised the educated world have scarcely affected the peasant. In his inmost beliefs he is what his forefathers were in the days when forest trees still grew and squirrels played on the ground where Rome and London now stand. Hence every inquiry into the primitive religion of the Aryans should either start from the superstitious beliefs and observances of the peasantry, or should at least be constantly checked and controlled by reference to them. Compared with the evidence afforded by living tradition, the testimony of ancient books on the subject of early religion is worth very little. For literature accelerates the advance of thought at a rate which leaves the slow progress of opinion by word of mouth at an immeasurable distance behind. Two or three generations of literature may do more to change thought than two or three thousand years of traditional life. But the mass of the people who do not read books remain unaffected by the mental revolution wrought by literature; and so it has come about that in Europe at the present day the superstitious beliefs and practices which have been handed down by word of mouth are generally of a far more archaic type than the religion depicted in the most ancient literature of the Aryan race.