Einstein's Unpublished Opening Lecture for His Course on Relativity Theory in Argentina, 1925.

This article explores the unpublished text of the opening lecture given by Albert Einstein for his course on the theory of relativity at the University of Buenos Aires (UBA) in Argentina in 1925. It gives a brief account of the individuals, institutions and events related to the text and compares it with the text of several lectures given by Einstein in Argentina where he briefly considered matters related to the philosophy of science. It references a short paper written by Mauricio Nirenstein in which he made some interesting remarks on the visit and the visitor.