Codex Ephraemi Rescriptus has been the neglected member of the family of great uncials. Photographic facsimiles have been produced of ℵ, A, B, D, and others, but only a sample page or two of the valuable palimpsest is available in textbooks. All the important codices have been studied and collated more than once. But as regards Codex C only Tischendorf has transcribed its text and edited it according to modern standards. In textbooks on textual criticism Codex C has been given—almost without excepdon—less than half the space of any of the other main uncials. To be sure, it is a difficult manuscript to read, and many lacunae exist. Yet because of its age and the quality of its text, as well as the fact that it contains portions of all the sections of the New Testament, every possible detail should be accurately extracted from this once beautiful codex. Owing to this unwarranted neglect of Codex C, especially the fact that no one had tested the accuracy of Tischendorf's work, a new study was undertaken and a new edition is being prepared. The present article will include (1) a brief history Of thern manuscript and its use by textual critics; (2) introductory items on which new light may be shed or on which previous statements need to be corrected; and finally, (3) a list of the more significant errors found in Tischendorf's edition.