Father Miguel Venegas' 1739 Obras Californianas is the most extensive and detailed document covering the first forty years of the Jesuit period in Baja California. In addition to providing discussions of historical events, Venegas wrote extensively on the natural world and on indigenous cosmology, social networks, and lifeways. The section translated and annotated here includes the bulk of Venegas' writing on Isla Cedros and its native people. The island, located on the Pacific Coast of central Baja California, was home to a large, maritime-adapted indigenous society. The period of time (1728-1732) covered in this section of the much larger Venegas manuscript details the tragic end of Cedros Island's indigenous society, but preserves an account of their culture that is of inestimable value. The annotations included provide not only clarifications of meaning, but critical evaluations of the text and of the significance of particular passages within the larger context of Baja California indigenous and colonial history.