"The many-coloured horses of the sun in the Indian mythology and solar myths may account for all these horses, astronomically or meteorologically. The old Aryan Aswa Medha or sacrifice of a black horse, and the twelve adventures of Arjuna as told in the Mahabharata, are something like this story in some general vague way. But the simplest explanation of this Menglay myth, fished out of the Atlantic, is to admit that 'the black horse' and all this mythical breed came west with men who rode from the land where horses were tamed, which is unknown."
_Source._--Kindly condensed by Mr. Alfred Nutt from Prof. Meyer's edition of _The Vision_ published in book form in 1892. This contains two versions, a longer one from a fourteenth century MS., _Leabhar Breac or Speckled Book_, and a shorter one from a sixteenth century MS. in the Library of Trinity College, Dublin. A translation of the former version was given by the late W. M. Hennessy in _Fraser's Magazine_, September, 1873. Prof. Wollner, who contributed to Prof. Meyer's edition an introduction dealing with the story from the standpoint of comparative literature, considers that the later version reproduces the original common source more nearly.
_Parallels._--At first sight _The Vision_ seems to picture the Land of Cockayne (on which see Poeschel, _Das Mährchen vom Schlaraffenlande_, Halle, 1878), but as Prof. Wollner remarks, the Irish form is much more simple and primitive, and represents rather an agricultural conception of a past _aurea aetas_. The conception of enormous appetite being due to the presence of a voracious animal or demon within the body is widespread among the folk. Prof. Wollner gives numerous parallels, _l.c._ XLVII.-LIII. The common expression "to wolf one's food" is said to be derived from this conception. On the personification of disease, see Tylor, _Primitive Culture_, ii. 148.
I can myself remember a tale somewhat similar to _The Vision_ which I heard from my nurse in Australia, I fancy as a warning against gluttony. She told me of a man, who in swallowing large pieces of food had swallowed a little hairy monster, which grew and grew and grew and caused the man to be eating all day to satisfy his visitors. He was cured by being made to fast, and then a bowl of brandy was brought in front of his mouth into which the hairy thing, attracted by the fumes, jumped and was drowned.