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 I shall leave it to Celtic [scholars to deal with Mr. MacRitchie's remarkable etymologies and with his historical arguments, confining myself to one or two observations on the traditional aspect of the theory. Now I should be the last to undervalue any traces of history to be found in tradition. I have elsewhere drawn attention to the importance of the study of this element in folk-tales; and I am quite ready to admit that nothing is more likely than the transfer to the mythical beings of Celtic superstition of some features derived from alien races. Savages and barbarians are in the habit of imputing to strangers and foes in greatly extended measure the might of witchcraft they claim for themselves. And the wider the differences between themselves and the foreigners, the more mysterious to them are the habits and appearance of the latter, and the more powerful do they believe them. All this might account for many details that we are told concerning the dwarfs, the Picts, the Finns, or by whatever other names the elvish race may have been known to Scots and Irishmen. But further than this I cannot go with Mr. MacRitchie. I hold his error, like that of Liebrecht already discussed, to be founded on too narrow an induction. This volume will have been written in vain, as it appears that for Mr. MacRitchie the vastly more important works of Dr. Tylor and Mr. Andrew Lang have been written in vain, unless I have made it clear that the myths of nations all over the world follow one general law and display common characteristics. I am not astonished to find the Shetland tale of marriage with a seal-woman reproduced on the Gold Coast and among the Dyaks of Borneo. But Mr. MacRitchie ought to be very much astonished; for he can hardly show that the historical Finns were known in these out-of-the-way places. It seems to me natural to find that in Scotland and Ireland fairies dwelt in barrows, and in Annam and