In 1925, the French Jesuit geologist, paleontologist, and theologian Pierre Teilhard de Chardin was removed from his teaching position at the Institut Catholique in Paris. He spent most of the next twenty years in China and his major theological writings were not published during his lifetime. We have uncovered major new archival sources on the investigation of Teilhard by the Jesuit curia and the Holy Office of the Roman Catholic Church. These include the Six Propositions to which he was required (...) to subscribe, which are here published and analyzed for the first time, along with his subscription. Associated correspondence, including a letter written by Teilhard to the Jesuit superior general Wlodimir Ledóchowski, enables a fuller understanding of Teilhard's response to the investigation of him. Moreover, comparison with similar investigations into other theologians in the first half of the 1920s allows an assessment of how the complex power dynamics between the Jesuit curia, the Holy Office, and Pope Pius XI shaped the outcome. (shrink)