The research so conducted was well rewarded. The history of Sulu was traced as far back as the early days of its oldest settlements, and the organization of the nation was followed back to the primitive communities out of which the Sulu nation has grown. Records of early Malayan expeditions and of communication between Sulu and Mindanao were traced to the earliest missionaries who reached these Islands by the way of Malacca, and through whom the sultanates of Mindanao and Sulu were organized on plans similar to those of Malacca and Palembang. A fuller account of the life history and work of these missionaries will be given in a later paper of this series. We here give only a narrative of the events in which they participated and the part they played in making the history of Sulu proper. Many difficulties were encountered in the effort to secure an authentic copy of the Genealogy of Sulu. Several trips of 20 to 40 miles were made in small Moro sailing craft to visit datus who were said to have copies of this document. The Sulu authorities who had the manuscript or copies of it denied this fact from time to time, but after two years and a half of persistent endeavor and inquiry, the original manuscript was procured from the prime minister of the Sultan of Sulu, whose confidence was gained by a long period of intimate acquaintance and frequent communication. Soon after that, the Annals of Sulu (the Luntar) were obtained from the sultan and some facts of importance were learned and made use of in the course of this work. Diligent effort was further made to collect all interesting Sulu traditions and documents, and most of the best informed Sulus living were interviewed. Of these the author feels under special obligation to mention Sheikh Mustafa bin Ahmad, formerly prime minister to Sultan Harun; Hadji Butu, prime minister of the present Sultan of Sulu; Datu Pangiran; and Hadji Mohammed Tayib, one of the principal advisers of the present sultan. After the first object sought had been gained, it became apparent that a general public interest in Sulu and Mindanao had been growing rapidly. It therefore seemed advisable to complete the history of Sulu up to the date of Spanish evacuation, for no such work has as yet been published in the English language. It is of special interest to Americans living in Mindanao and Sulu and of general interest to Americans and others elsewhere to have a better understanding of the Moros in general and to acquire some idea of the history of Islam in the Philippine Islands. This the history of Sulu makes possible for the reader in a most vivid and realistic manner. The history is written without prejudice or bias, and events are related as they appear in the light of facts, and by one capable of seeing things from the standpoint of a Sulu as well as of a Spaniard.