The following critical study of a Persian poet who flourished in the latter half of the eleventh and the beginning of the twelfth centuries of the Christian era, and who, though highly esteemed by his contemporaries, is little known in Europe, is from the pen of my accomplished friend Mírzá Muḥammad of Qazwín, a Persian scholar of rare attainments in his own and the Arabic languages, and of still rarer critical acumen, who is now engaged in preparing a critical edition, with notes, of the Chahár Maqála, which, when ready, will be published by the Trustees of the E. J. W. Gibb Memorial. In the course of his work he had occasion to collect materials too extensive to be incorporated in the notes on that text, and amongst them the following study, compiled from numerous manuscript sources. This I make no excuse for presenting in English dress to the readers of the Journal, for from such careful monographs must the Literary History of Persia be ultimately built up, and at present they are, alas! all too few.