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Karl Popper,In Search of a Better World: Lectures and Essays from Thirty Years. Routledge,London and New York,1992. Pp. x,245. £25.00. Karl Popper,A World of Propensities. Thoemmes,Bristol,1990. Pp. ix,51. £5.99 (paper). John R. Wettersten,The Roots of Critical Rationalism. Rodopi,Amsterdam and Atlanta,GA,1992. Pp. 254. $68.97