In September 1931, a public discussion was convened at Central Hall Westminster on the subject of the "Evolution of the Universe," at the centenary meeting of the British Association for the Advancement of Science. This early window into the public face of relativistic cosmology reveals a diversity of attitudes entertained in practice at the time, concerning the role of scale in cosmological theorizing. Here, we consider the views advanced by two of the participants in that discussion: Willem de Sitter and Georges Lemaître. (Work co-authored with Mike Schneider, currently postdoc at the Center for Philosophy of Science at the University of Pittsburgh.)