The Treatise on the Elucidation of the Knowable by the Tibetan master 'Phags-pa was composed in 1278 as a ""manual of Buddhism"" for crown prince Zhenjin, second son of the Mongol emperor Qubilai. ""The Cycle of the Formation of the Schismatic Doctrines"" is based on Xuanzang's seventh-century Chinese translation (""Yibuzonglunlun"") of the ""Samayabhedoparacanacakra"", an essay by the first-century scholar-monk Vasumitra on the various schismatic doctrines that began to arise soon after the Buddha's lifetime. This work presents two titles in one volume.