Two are traceable exclusively to the influence of the Mantik ut-tair of Ferid ud din Attar. Two quatrains primarily inspired by Omar were influenced by the Odes of Hafiz. And three, which appeared only in the first and second editions and were afterwards suppressed by Edward FitzGerald himself, are not--so far as a careful search enables me to judge--attributable to any lines of the original texts. Other authors may have inspired them, but their identification is not useful in this case. The «fillip,» so to speak, given to FitzGerald's interest in the ruba'iyat, by the publication of Monsieur J.B. Nicolas' text and translation of 464 «_Les Quatrains de Khèyam_» (Paris, 1867), must not be lost sight of, and may be held responsible for many, if not most of the variations and additions that differentiate the second, third, and fourth editions from the first. This volume, as FitzGerald himself records in his Introduction to the second and subsequent editions, «reminded him of several things and instructed him in others.» Two of FitzGerald's later quatrains at least (Nos. 46 and 98) come from that text, and these I have never seen in any MS. text; and, in seeking the parallels to the present volume, I have collated exactly 5,235 ruba'iyat in the original Persian. I have appended to every Persian ruba'i in the following pages, references to the texts in which I have found the same ruba'i, in the identical form, or more or less varied, and it will be observed that, for the most part, the ruba'iyat which inspired FitzGerald are those which have so appealed to the Oriental mind as to be represented in nearly all the MSS. and texts under examination. The Ouseley MS. being the first text that occupied FitzGerald's attention, where his inspirational lines occur both in that MS. and the Calcutta MS., I have given the Ouseley MS. version, noting any important variations to be found in the Calcutta MS. It will be observed that FitzGerald's tendency, after the second edition, was to eliminate quatrains which were merely suggested by the general tone and sentiment of the original poem, and not the reflection or translation of particular and identifiable ruba'iyat. The reader is especially recommended, when studying these parallels, to turn to the corresponding quatrain in the first edition, for FitzGerald often diverged further from the originals in making his subsequent variations--notably, for instance, in the first and forty-eighth quatrains. With regard to my own translations of the originals in the following pages, I may remark that the excessive baldness of the translation is intentional, for I deemed it better to put before the lovers of FitzGerald's poem the closest and most unpolished English rendering, rather than to attempt to clothe the literal meaning of the originals in graceful phraseology.