The Chester Beatty Gospels codex, also known as Papyrus 45, is one of the most important witnesses for the textual history of the Gospel of Mark. Earlier it was thought to represent a "pre-Caesarean text" together with Codex Washingtonianus; a text regarded by some as a primitive and unrevised text. Through the work of Larry W. Hurtado, however, the theory of a "pre-Caesarean text" received a deathblow. His quantitative analysis did confirm a textual relationship between P45 and W, but they in turn showed no particular affinity to other purported "Caesarean" witnesses. Further, his analysis of the readings of W (and P45) in Mark showed that this text was often secondary reflecting "a freedom to amend it in the interest of readability and religious edification." Whereas the Caesarean text has now sunk into relative oblivion, the fact remains that P45 and W represent a very early textual cluster in Mark, which still deserves close attention. Hurtado's study of P45 was based on 103 variation-units derived solely from the well-preserved parts of P45. This study examines the text of P45 in its other extant passages in Mark.