The eternal ground of all existence which every one carries in himself, Being as it is in itself, and as it is immediately perceived in thinking, was, accordingly recognised as the sole reality, and all the manifold changes of the phenomenal world were called Maya, a sham, a delusion, a mockery of the senses. We see, it is a consistent monism which is taught in the Upanishads. I do not intend here either to criticise the Brahman conception of monism or to contrast it with modern forms of monism. All monisms have at least one thing in common, viz. they all recognise the paramount importance of consistency of thought as a basic principle in philosophy. And to have propounded a monism for the first time is a feat which cannot be overestimated. What remains of this essay will be devoted to the investigation of the question, whether this feat is duly or unduly credited to the Brahmans. It may first be mentioned, that a few scholars like Weber, Max Müller, Regnaud, Deussen, and Bhandarkar, pointed out, a long time ago, certain facts which show that another class of the Hindu nation founded the monistic doctrine of the old Upanishads. But the attention of the great public has never been called to this subject, which deserves to be known by all interested in Indian history. In the second book of the Brihadâranyaka Upanishad, of which I have already cited two passages, is found the following story, of which also the fourth book of Kaushîtaki Upanishad gives a slightly different version.