The first Nephi, who left Jerusalem with a small company of colonists led out from that city by his father, Lehi, 600 B.C., and who afterwards became their leader, prophet, and their first king, made two sets of plates, on which he proposed engraving the history of his people. On the larger of these two sets he engraved an account of his father's life, travels, prophecies, etc., together with his genealogy; and upon them also he recorded a full history of the wars and contentions of his people, as also their travels, and an account of the cities they founded and colonies they established. These larger plates were preserved in the care of succeeding kings, or judges of the republic when the kingdom was transformed into one; and, in a word, upon them was written a full history of the rise and fall of the nations which existed in America from the landing of this colony from Jerusalem to 400 A.D., a period of nearly one thousand years. {155} It is quite evident that as these plates were transmitted from king to king, or from one ruling judge of the republic to another, or given into the possession of a prophet, that they each recorded the historical events of his own day, and gave to such account his own name--hence Mormon found in these "larger plates" of Nephi--the Book of Mosiah, the Book of Alma, the Book of Helaman, etc. Furthermore, it happened that there were colonies from time to time that drifted off into distant parts of the land, and became lost for a season to the main body of the people; and there were missionary expeditions formed for the conversion of the Lamanites; and these parties, whether missionary or colonial, generally kept records; and when these colonists or missionary parties were found, or returned to the main body of the people, their records were incorporated within the main record, being kept by the historian--hence there was, sometimes, a book within a book, and the current of events was interrupted to record the history of these detached portions of the people, or some important missionary expedition. Mormon, when abridging these plates of Nephi, gave to each particular division of his abridgment the name of the book from which he had taken his account of the events recorded--hence the Books of Mosiah, Alma, Helaman and III. and IV. Nephi in his abridgment. He also, in some instances at least, followed the subdivisions we have alluded to, hence we have the record of Zeniff within the Book of Mosiah (page 181, N. E.); the account of the church founded by the first Alma (page 213); and the account of the missionary expeditions of the sons of Mosiah to the Lamanites within the Book of Alma (page 283).