There is much to support the opinion of Rāmānuja, Dr. Thibaut, and many others, that Śaṃkara's doctrine of “illusion” is a biassed rendering of the old Vedānta, Bādarāyaṇik as well as Aupanishadic. If that be granted, it is by no means self-evident that Buddhism has been without influence on Śamkara's speculation; and the last writer on the subject, Vasudev Anant Sukhtankar, a very able pupil of Professor Jacobi, does not conceal his opinion, or his surmise, that Śaṃkara is indebted to Nāgārjuna. That may be true, but I would object that we really know little or nothing about the history of Vedānta, and that conclusions based on philosophical parallels are by no means definitive. Autonomous developments— autonomous if not absolutely independent—are admissible. Nāgārjuna (or his predecessors, the anonymous authors of the oldest Mahāyānasūtras), by the very fact that he proclaims “voidness” to be the real nature of things, was prepared to distinguish the relative truth (saṃvṛtisatya) and the absolute one (pāramārthika); and his nihilism coupled with “idealism” might lead to the Vijñānavāda: “existence of pure non-intelligent (?) intellect.” On the other hand the Aupanishadas, from their main thesis (tat tvam asi, etc.), could derive the distinction of the two brahmans, of the two vidyās. Both developments are natural enough; the conception of the universal void (o) and the intuition of the infinite (∞) are convergent, in the end; but parallel and convergent as they are, these developments do not lose their primitive tinge.