The names by which these dwellers underground are known are mostly derivative from the word _sìth_ (pronounced _shee_). As a substantive (in which sense it is ordinarily used) _sìth_ means ‘peace,’ and, as an adjective, is applied solely to objects of the supernatural world, particularly to the Fairies and whatever belongs to them. Sound is a natural adjunct of the motions of men, and its entire absence is unearthly, unnatural, not human. The name _sìth_ without doubt refers to the ‘peace’ or silence of Fairy motion, as contrasted with the stir and noise accompanying the movements and actions of men. The German ‘still folk’ is a name of corresponding import. The Fairies come and go with noiseless steps, and their thefts or abductions are done silently and unawares to men. The wayfarer resting beside a stream, on raising his eyes, sees the Fairy woman, unheard in her approach, standing on the opposite bank. Men know the Fairies have visited their houses only by the mysterious disappearance of the substance of their goods, or the sudden and unaccountable death of any of the inmates or of the cattle. Sometimes the elves are seen entering the house, gliding silently round the room, and going out again as noiselessly as they entered. When driven away they do not go off with tramp and noise, and sounds of walking such as men make, or melt into thin air, as spirits do, but fly away noiselessly like birds or hunted deer. They seem to glide or float along rather than to walk. Hence the name _sìthche_ and its synonyms are often applied contemptuously to a person who sneaks about or makes his approach without warning. Sometimes indeed the elves make a rustling noise like that of a gust of wind, or a silk gown, or a sword drawn sharply through the air, and their coming and going has been even indicated by frightful and unearthly shrieks, a pattering as of a flock of sheep, or the louder trampling of a troop of horses. Generally, however, their presence is indicated at most by the cloud of dust raised by the eddy wind, or by some other curious natural phenomenon, by the illumination of their dwellings, the sound of their musical instruments, songs, or speech. For the same reason _sìth_ is applied not merely to what is Fairy, but to whatever is Fairy-like, unearthly, not of this world. Of this laxer use of the term the following may be given as illustrations: