 But soon it did. Still in 1920, Schlick objected, both publicly and in private correspondence with Reichenbach, that “principles of coordination” were precisely statements of the kind that Poincaré had termed “conventions” (see Coffa 1991: 201ff.). Moreover, Einstein, in a lecture of January 1921, entitled “Geometry and Experience”, appeared to lend support to this view. Einstein argued that the question concerning the nature of spacetime geometry becomes an empirical question only on certain pro tem stipulations regarding the “practically rigid body” of measurement (pro tem in view of the inadmissibility in relativity theory of the concept “actually rigid body”). In any case, by 1922, the essential pieces of Reichenbach’s mature conventionalist view had emerged. The argument is canonically presented in §8 (entitled “The Relativity of Geometry”) of Der Philosophie der Raum-Zeit-Lehre (completed in 1926, published in 1928). In a move superficially similar to the argument of Einstein’s “Geometry and Experience”, Reichenbach maintained that questions concerning the empirical determination of the metric of spacetime must first confront the fact that only the whole theoretical edifice comprising both geometry and physics admits of observational test. Einstein’s gravitational theory is such a totality. However, unlike Einstein, Reichenbach’s “method of analysis of science”, later re-named “logical analysis of science”, is directed to the epistemological problem of factoring this totality into its conventional or definitional and its empirical components.