Bill Lawvere has drawn my attention to a significant moment in the history of the application of the ideas of algebraic theories to computer science of which I was quite unaware. In 1967 Eilenberg gave the four Colloquium Lectures at the Summer Meeting of the AMS in Toronto. Available details are as follows. August 29-September 1, 1967, Toronto, Ontario, Canada. Samuel Eilenberg, Columbia University. Universal algebras and the theory of automata. Contrary to what one might suppose this material did not appear in any of the books or papers of Eilenberg or his collaborators; but lecture notes were distributed at the meeting. Does anyone have a copy which they could make available? The notes would be of great interest right now from a historical point of view for a paper by John Power and me. But it seems likely that formulations in the notes would be of wider interest as by the time (at least) of the notes it seems that Eilenberg had digested the material in Lawvere's thesis. In hope, Martin Hyland