Some of the cerauniae, says Pliny, are like hatchets. He would have been nearer the mark if he had said 'are hatchets' outright. But this _apercu_, which was to Pliny merely a stray suggestion, became to the northern peoples a firm article of belief, and caused them to represent to themselves their god Thor or Thunor as armed, not with a bolt, but with an axe or hammer. Etymologically Thor, Thunor, and thunder are the self-same word; but while the southern races looked upon Zeus or Indra as wielding his forked darts in his red right hand, the northern races looked upon the Thunder-god as hurling down an angry hammer from his seat in the clouds. There can be but little doubt that the very notion of Thor's hammer itself was derived from the shape of the supposed thunderbolt, which the Scandinavians and Teutons rightly saw at once to be an axe or mallet, not an arrowhead. The 'fiery axe' of Thunor is a common metaphor in Anglo-Saxon poetry. Thus, Thor's hammer is itself merely the picture which our northern ancestors formed to themselves, by compounding the idea of thunder and lightning with the idea of the polished stone hatchets they dug up among the fields and meadows. Flint arrowheads of the stone age are less often taken for thunderbolts, no doubt because they are so much smaller that they look quite too insignificant for the weapons of an angry god. They are more frequently described as fairy-darts or fairy-bolts. Still, I have known even arrowheads regarded as thunderbolts, and preserved superstitiously under that belief. In Finland, stone arrows are universally so viewed; and the rainbow is looked upon as the bow of Tiermes, the thunder-god, who shoots with it the guilty sorcerers.