PREFACE. When, in the year 1900, I completed and published my Hand-list of the Muḥammadan Manuscripts in the Library of the University of Cambridge (which was itself the sequel and complement to the Catalogue of the Persian Manuscripts of the same Library pub- lished four years earlier), I resolved that never again, if I could help it, would I undertake the drudgery of cataloguing any but the smallest and most choice collections of Oriental books. Unfortu- nately, as the Persian proverb says :— تدبير تقديررا بر نمى گرداند "Human foresight cannot avert predestined fate." My talented and valued friend Dr. E. Denison Ross (till lately Professor of Persian at University College, London), to whom the cataloguing of the two collections described in the following pages was entrusted by the India Office, accepted the post of Principal of the Muham- madan Madrasa College at Calcutta ere his work was completed, and sailed for India on October 17, 1901. In undertaking to complete his work, and in so doing to run counter to the decision above mentioned, I was actuated by two strong motives, friendship for one of the most gifted and amiable of my fellow-workers, and gratitude to the most liberal and enlightened of English Libraries. In nearly all civilised countries except England, manuscripts are freely lent (subject to reasonable precautions) by public Libraries to native and foreign scholars, whereby research is not merely aided but rendered possible. The general practice of English Libraries in refusing to