Published online by Cambridge University Press: 14 March 2022
Professor Massey's exposition and analysis [5] of Professor Grünbaum's writings on metric aspects of space seem to me both very helpful in understanding those writings and to contain a considerable original contribution to the subject. Nevertheless I would like to argue that there is an alternative to Massey's explication which seems to me more faithful to Grünbaum's remarks; it seems at least to have the virtue of not forcing Grünbaum to reject the usual mathematical definitions of the notions used.
The author wishes to thank Professors Massey and Grünbaum for their helpful correspondence; and Professor P. Asquith, Michigan State University, and Professor C. Glymour, Princeton University, for stimulating discussions.