One of the many treasures of the Newberry Library in Chicago is the valuable philological library of Prince Louis-Lucien Bonaparte. In this large collection is a German translation of Thomas a Kempis's famous devotional work, Imitatio Christi. This volume (Incunabulum 1699) Ein ware nachuolgung Cristi was printed by Anthonius Sorg in Augsburg in 1486, and according to Victor Collins in An Attempt at a Catalogue (London 1894), 478, is the first known German translation. At the end of the book are 66 pages of German manuscript to which the attention of the editors was called by Professor James Taft Hatfield. They are indebted also to Dr. Pierce Butler, formerly of Newberry Library, who has kindly put the manuscript at their disposal for further examination.