capitulations, official letters, decrees, and correspondence relative to Sulu obtained from the Division of Archives of the Philippine Islands. The originals of the copies can be seen in Spain in the Indies Archives.

Some liberty has been taken in correcting the spelling of geographical and other proper names in order to render the history uniform in its orthography and to avoid confusion and misconnection of events, persons, and places. The same system of orthography has been used here as that used and described in Part 1 of Volume IV, Ethnological Survey Publications. Diacritical signs to denote the long sounds of vowels have, however, been very rarely used. The Arabic “hamzat,” occurring in Moro words has been expressed by an apostrophe; while an inverted apostrophe has been used to represent the Arabic sound or character “ʿain,” the eighteenth letter of the Arabic alphabet. Annotations which occur in the original documents have generally been indicated by letters, while those made by the author are denoted by figures.

Manila, January, 1907.