(2) A MS. bearing the inscription ‪פירוש מסכת אבות ופירוש אגדות בתלמוד‬, Commentary on the Ethics of the Fathers, and on the Agadoth in the Talmud. (3) ‪אגרת התנצלות‬, An apologetical Letter. This well-known and often-quoted letter was addressed by Yedaya to Rabbi Solomon ben Adereth (‪רש״בא‬), on the occasion of his publicly censuring the Jewish communities of the Provence for their occupying themselves with scientific studies. There a passage occurs which throws some light on the author's own ideas thereon. It was as follows:— “We cannot give up science; it is as the breath of our nostrils. Even if Joshua were to appear and forbid it we would not obey him; for we have a warranty which outweighs them all, viz. Maimuni, who recommended it, and impressed it upon us. We are ready to set our goods, our children, and our lives at stake for it^[79-1].” (4) A Liturgical Poem. It is composed of a number of words, each of which begins with the letter _Aleph_ (‪א‬), and refers, according to Graetz^[79-2], to the sufferings endured by the French Jews in 1306. (5) A Treatise on Medicine, based on a similar work composed by the Jewish philosopher Ibn Sina. (6) ‪כתב הדת‬, “A Treatise on Intellect.” This, too, is based on another book treating of a kindred subject, and bearing the inscription ‪ספר השכל‬ ‪והמושכלות‬, the author of which is Al-Fabri. A Latin translation of the latter exists under the title of _De Intellectu et Intellecto_, Venice, 1595. (7) ‪הדעת בשכל החמרי‬, “Opinions on the Material Intellect.” (8) ‪המאמר בהפכי המהלך‬ is a philosophical treatise on the movements of bodies, and has been quoted by Ibn Habib under the title of ‪כתב הפכי‬ ‪האנח‬. (9) ‪כתב ההתעצמות‬, “Treatise on Consolation.” (10) Is a MS. without any title; but judging from its contents, it seems to correspond with the ‪ספר הצורות המיניות‬ once quoted by the same Ibn Habib. (11) ‪מדבר קדמות‬, “The Desert of Kedemoth.” This is a commentary on the twenty-five propositions placed by Maimonides at the beginning of the tenth chapter of his ‪מורה נבוכים‬. (12) A Hebrew poem, having for its subject the thirteen articles as arranged by Maimonides. The authorship of the following four compositions is also attributed to Yedaya:— (1) A Divan, compiled by a member of the family of Bedaresi, that member being, according to Luzzatto, no other than our Yedaya. (2) ‪מעדני מלך‬, “The Pleasure of a King,” is a short treatise on the game of Chess, and has several times appeared in print. (3) Wolf, in the _Bibliotheca Rabbinica_, I, p. 403, attributes to Yedaya the authorship of a commentary on another commentary, written by Abraham Ibn Ezra on the Book of Genesis, the former of which exists as a MS. in the Paris National Library. (4) ‪אגרת התשובה‬, “A Letter of Response,” This letter, which was published by Dr. Berliner in 1888, and copies of which are found in various MSS., is attributed to Yedaya by Bartolocci and de Rossi.