ABSTRACT
The problem of freedom and determinism is one of the most enduring, and one of the best, problems of philosophy; one of the best because it so tenaciously resists solution while yet always seeming urgent, and one of the most enduring because it has been able to present itself in different ways to suit the pre-occupations of different ages. 'Freedom', of course, can mean many things, and before the account can proceed with sanity it will be necessary to get a pretty clear idea of just what sort of freedom it is that the author wants to give a libertarian theory of. Determinism is the doctrine that what happens must happen, that all true propositions recording events in the universe are necessary propositions and all false ones impossible. Physiological determinism in its various forms is the most urgent and plausible of the four.
