The investigation is concerned to the textual criticism at Genesis book, transcript across the IX scroll rolls from the Museu Nacional collection, in Rio de Janeiro, named Pergaminhos Ivriim. These ones are a square consonantal Hebrew writing, as fragments and complete books, which have been brought by D. Pedro II, Regent of the Second Brazilian Kingdom, along his first travel to Europe, in 1871 and 1872. The analysis is related to the investigation about of massoretic features, divisions and scribal errors through the rolls I, II and III, concerned to the fragments of Genesis book, evaluated under rules formulated from the principles of Old Testament scholars. So that, some questions were posed, as the criteria used to find out the textual variants, the reasons to appoint the textual family and the period of its transcription. The conclusions were obtained by textual confrontation between the Genesis writing fragments according diferents periods of Hebrew text: ancient massoretic, late medieval and contemporary. These ones were closely connected each other under three stages of investigation: The first step related to the collation. The second step concerned to the analysis of the readings. The third step affected the textual family.