  In an article published by Mauricio Nirenstein in 1925, a few months after
the visit of Albert Einstein to Argentina, the author wrote various comments
and references relative to the scientist's visit. In particular, Nirenstein
mentioned a personal conversation he had with Einstein in which the sage
expressed many interesting ideas on the epistemology of physical sciences. In a
note to that article, it was indicated that Einstein would have left in the
hands of Nirenstein some notes of a speech he wanted to deliver at the
University of Buenos Aires. From 1931 onwards there appeared in a few journals
of this city, different versions of what became known as the "inedito" of
Einstein. In this paper we discuss both the facts and the individuals. We
analyse briefly the "inedito" and we compare it with the two introductory
lectures Einstein delivered at the University of Buenos Aires and at the
Faculty of Science.
