The work covers the subject in great detail. A distinctive aspect of the work is how closely the treatment adheres to the fundamental texts of the various schools. These books discuss the development of religious and spiritual thought as well as philosophical inquiry, beginning with the main Upanisads and moving through the Puranas, the Gitas, the Manusamhita, and the Ramayana while explaining the concepts that were present in all of these texts. The examination of the original manuscripts served as the basis for the book. Though it focuses on their ontology, it deals with the systems' epistemology, logic, ontology, psychology, ethics, and religion. It provides in-depth analyses of Gangesa's Carvaka, Vaisesika, Nyaya, and Navya Nyaya logic.It deals with Bhartrhari?s linguistic monism as expounded in his Vakyapadiya (Brahma-kanda), which is a unique type of philosophy. The subject matter of Vol. I is the philosophies of the Upanisads, the Epics, the Puranas, the Gita, the Philosophies of the Carvakas, the Vaisesika, the Nyaya, the Navya Nyaya, the Mimamsa and the ?abdika of Bhartrhari. Vol. II deals with the philosophies of Samkhya, the Yoga, Jainism, Buddhism, Advaita Vedanta and other Theistic Vedanta, Saivism, Saktism: while Vol. III contains the philosophies of Bh?skara, Saivism and different ?aiva schools and the problem of post Sankara Advaitavada. Dr. Jadunath Sinha's significant work on Indian Philosophy in three volumes deals with the subject comprehensively. His treatment closely follows the basic texts of the various schools, which is a unique feature of the work. The topics included in the volumes are as under: Volume I: The major and minor Upanisads; Epics; Puranas; Gita, Carvaka, Vaisesika; Nyaya; Navya Nyaya; Mimamsa; Sabdika. Volume II: Samkhya; Yoga; Jaina; Early Buddhism; Schools of Buddhism; Background of Vedanta; Advaita; Bhagavad Gita; Bhagavata; Pancaratra; Ramanuja; Madhva; Nimbarka; Vallabha; Caitanya; Saivism & Saktaism. Volume III: Bhaskara; Kasmira Saiva; Pasupata; Saiva Siddhanta; Srikantha; Vira Saiva; Post-Sankara Advaita.