For the elucidation of our mythology in its Germanic form, for instance, the materials, although they are not wholly wanting, are yet difficult to make use of, since they are widely scattered, and must be sought partly in quite corrupted popular legends, partly in writings of the middle ages, where they are sometimes found interpolated, and where we often least should expect to find them. But in its Norse form we have ample material for studying the Asa-mythology. Here we have as our guide not only a large number of skaldic lays, composed while the mythology still flourished, but even a complete religious system, written down, it is true, after Christianity had been introduced in Iceland, still, according to all evidence, without the Christian ideas having had any special influence upon its delineation, or having materially corrupted it. These lays, manuscripts, etc., which form the source of Norse mythology, will be more fully discussed in another chapter of this Introduction. We may add further, that if we had, in a complete system, the mythology of the Germans, the English, etc., we should find, in comparing them with the Norse, the same correspondence and identity as see find existing between the different branches of the Teutonic family of languages. We should find in its essence the same mythology in all the Teutonic countries, we should find this again dividing itself into two groups, the Germanic and the Gothic, and the latter group, that is, the Gothic, would include the ancient religion of the Scandinavians, English, and Low Dutch. If we had sufficient means for making a comparison, we should find that any single myth may have become more prominent, may have become more perfectly developed by one branch of the race than by another; one branch of the great Teutonic family may have become more attached to a certain myth than another, while the myth itself would remain identical everywhere. Local myths, that is, myths produced by the contemplation of the visible workings of external nature, are colored by the atmosphere of the people and country where they are fostered. The god Frey received especial attention by the Asa-worshipers in Sweden, but the Norse and Danish Frey are still in reality the same god. Thunder produces not the same effect upon the people among the towering and precipitous mountains of Norway and the level plains of Denmark, but the Thor of Norway and of Denmark are still the same god; although in Norway he is tall a mountain, his beard is briers, and he rushes upon his heroic deeds with the strength and frenzy of a berserk, while in Denmark he wanders along the sea-shore, a youth, with golden looks and downy beard.