In 1901–1906 the publishing office of Hubert Welter in Paris issued a new edition of the well-known “Sacrorum conciliorum nova et amplissima collectio,” edited in 1759–1798 by J. D. Mansi. This “new Mansi” is a mere reprint, which allowed no correction or enlargement of Mansi's text, the pages being reproduced almost photographically. Did the publisher of this reprinted Mansi and his advisers give a “testimonium paupertatis” to modern scholars, by thus reproducing a collection which appeared one hundred and fifty years ago? Not in the least. The modern manner of editing ancient texts was rather recognized than disregarded by assuming that a really new edition of Mansi's collection was impossible. It was indeed quite impossible; for while all scholars who have made use of Mansi's collection have perceived its defects, yet at the same time they have seen that to correct them would require more time than can be spent on a new edition.