A different picture of learning is suggested by Karl Popper's account of knowledge growing through 'conjectures and refutations'. The facts of human language are best explained by taking language acquisition to be a case of Popperian learning.

Problems Section. Problem 3 by Richard Sharvy. Solution to Problems 1 and 2 from previous issue (3:1).

Chomsky has constructed an empirical theory about syntactic universals of natural language by defining a class of 'possible languages' which includes all natural languages (inter alia) as members, and claiming that all natural languages fall .within a specified proper subset of that class. I extend Chomsky's work to produce an empirical theory about natural4anguage semantic universals by showing that the semantic description of a language will incorporate a logical calculus, by defining a relatively wide class of 'possible calculi', and by (...) specifying a proper subset of that class which, I hypothesize, includes the calculi needed for the semantic description of any natural language. I argue that the special status, with respect to natural languages, of this particular type of logical calculus is an empirical finding which does not follow from any independently-known principles, and I conclude that the question why the laws of human thought have the structure they do is a biological rather than a logical question. (shrink)

FERDINAND DE SAUSSURE, rev. ed. by Jonathan Culler Iíhaca, N.Y.: Cornell University Press, 1986. 157pp., $23.50 IN SEARCH OF SEMIOTICS by David Sless Totawa, N.J.: Barnes & Noble, 1986. 170pp., $28.50.