THEORY OF KNOWLEDGE IN MARX 55 17 V I Lenin, "Philosophical Note Books", Collected Works, Vol 33, Moscow, 1963, pp 92-93. 18 Georg Lukacs, History and Class Consciousness, London, Merlin Press, 1971. See Note 6, p 24. 19 Alfred Schmidst, The Concept of Nature in Marx, London, 1971. See specially Append'x, pp 195-196. 20 Engels, Anti-Duhring, Moscow, 1959, p 54. 21 Ibid, p 166.