[Footnote 1: See below and also my book on _The Materials from Arabic sources,_ &c., 63-66. Like Masudi in his _Kitab_ at Tambih, Asadi in his _Lughal al-Furs_ (Asadi's _neupersischen Worterbuch Lughat al-Furs,_ edited by P. Horn, 1897, 110, 1), identifies the word _ain_ with the word _rasam,_ practice or custom. As regards the word _ain_ in the Iranian languages see Horn _Grundriss der neu persischen Etymologie_, 15-16; Hubschmann, _Persische Studien_ 11, and B.G.A. IV, 175, and VIII, Glossarium IX. To understand the ancient usage of the term the modern Parsi expression _Dad wa ain din_ in the sense of religious law and custom helps us. In this phrase the word _dad_ corresponds to the modern Musalman _shariyat_ and the word _ain_ to _adat_. Regarding its special meaning in the Umayyad times see J. Wellhausen _Das Arabische Reich und sein Sturz_ 189.] [Footnote 2: Most probably in connection with the materials of this book stood A collection of Persian genealogy written by the well-known Ibn Khurdadbeh (Fihrist 149, 4), representing a peculiar antithesis to the numerous selections of Arab tribal and family genealogies.] [Footnote 3: Here are first mentioned the two books translated by Jabala ibn Salim, namely, the _Book of Rustam and Isfandiyar_ and the _Book of Behram Chobin_ (the well-known Romance of the King about which, sea Noeldeke's Tabari 474-478), and further the _Book of Shahrzad and Aberviz_ (which no doubt was connected with the _Thousand and one Nights_), the _Book of Kar Nameh_ or the "Acts" of Anushirwan belonging to the same class of books as the _Kar Nameh of Ardashir_. Then the books that interest us are the _Book of Taj_, the _Book of Dara and the Golden Idol_, the _Ain Nameh_, the _Book of Behramgor and his brother Narseh_ and finally, one more _Book of Anushirwan._] It is possible that the book of Ibn al Mukaffa was not the first translation of the Persian book since this title is applied by not a few other Arabic writers of the time to some of their own works. (For example, Abu Ubaida, See Goldziher _Muhammed Studien_ 1,198).