The present writers had the good fortune to visit the Pierpont Morgan Library in 1915. One of the first manuscripts put into their hands was this early sixth-century fragment of Pliny’s _Letters_, which forms the subject of the following pages. Having received permission to study the manuscript and publish results, they lost no time in acquainting classical scholars with this important find. In December of the same year, at the joint meeting of the American Archaeological and Philological Associations, held at Princeton University, two papers were read, one concerning the palaeographical, the other the textual, importance of the fragment. The two studies which follow, Part I by Doctor Lowe, Part II by Professor Rand, are an elaboration of the views presented at the meeting. Some months after the present volume was in the form of page-proof, Professor E.T. Merrill’s long-expected edition of Pliny’s _Letters_ appeared (Teubner, Leipsic, 1922). We regret that we could not avail ourselves of it in time to introduce certain changes. The reader will still find Pliny cited by the pages of Keil, and in general he should regard the date of our production as 1921 rather than 1922. The writers wish to express their gratitude for the privilege of visiting the Pierpont Morgan Library and making full use of its facilities. For permission to publish the manuscript they are indebted to the generous interest of Mr. J. Pierpont Morgan. They also desire to make cordial acknowledgment of the unfailing courtesy and helpfulness of the Librarian, Miss Belle da Costa Greene, and her assistant, Miss Ada Thurston. Lastly, the writers wish to thank the Carnegie Institution of Washington for accepting their joint study for publication and for their liberality in permitting them to give all the facsimiles necessary to illustrate the discussion. E. K. RAND. E. A. LOWE. CONTENTS. Part I. THE PALAEOGRAPHY OF THE MORGAN FRAGMENT. By E. A. Lowe. Description of the Fragment Contents, size, vellum, binding Ruling Relation of the six leaves to the rest of the manuscript Original size of the manuscript Disposition Ornamentation Corrections Syllabification Orthography Abbreviations Authenticity of the six leaves Archetype The Date and Later History of the Manuscript On the dating of uncial manuscripts Dated uncial manuscripts Oldest group of uncial manuscripts Characteristics of the oldest uncial manuscripts Date of the Morgan manuscript Later history of the Morgan manuscript Conclusion Transcription Part II. THE TEXT OF THE MORGAN FRAGMENT. By E. K. Rand. The Morgan Fragment and Aldus’s Ancient Codex Parisinus The Codex Parisinus The Bodleian volume The Morgan fragment possibly a part of the lost Parisinus The script Provenience and contents The text closely related to that of Aldus Editorial methods of Aldus