l x x i v I N T R O D U C T I O N T O V O L U M E 1 6 was one such point. Meyerson argued that what Einstein had been doing when try- ing to incorporate electromagnetism into the framework of general relativity amounted to reducing it to the structure of space. While conceding to Meyerson on all other issues, Einstein remained adamant on this one: “With regard to the second point, the one about “geometrization,” I have not changed my mind. I still think that the word ‘geometric’ is not saying anything at all (‘ist nichtssagend’)” (Doc. 40). As to the rest, Einstein invited Meyerson to correct him to his heart’s content (Doc. 40 and Abs. 204). Meyerson’s answer to this offer (Abs. 221) is polite shock: nothing would be fur- ther from his intentions than to give even the appearance of contradicting Einstein. Still, given that Einstein had said that some of Meyerson’s remarks were valid, he tentatively asked whether Einstein would not allow him to suggest some ever-so- slight modifications to the original review before publication in the Revue Philosophique. In the end, Einstein authorized Meyerson to change his review quite a bit (Abs. 237, 334). The final published French version (Doc. 152) is therefore quite different from the German draft (Doc. 6). For example, in the paragraph cited above in which Einstein opposes seeing general relativity as reducing physics to geometry, the French version of the review does not say that Einstein is of an en- tirely different opinion from Meyerson, but merely that he wishes to avoid a possi- ble misinterpretation of the book. While their correspondence was still ongoing, Einstein geared up to review another philosophical book, this one by Hans Reichenbach. The book absorbed a revised and expanded version of the text Einstein and Reichenbach had discussed the year before, which became part of an appendix to Reichenbach 1928. Einstein was reading the book while on his way to the Solvay Congress in October 1927. In a letter to Elsa after his arrival in Brussels, he seemed somewhat exasperated: “I finished reading Reichenbach. Having such a high opinion of oneself must be de- lightful, but less so for other people” (Doc. 74). In contrast, Einstein appreciated Moritz Schlick’s modesty. He had recommended that Meyerson write to the “espe- cially genial” Schlick in order to obtain additional literature on the philosophical analysis of relativity theory, and pointed out that Meyerson would have to ask Schlick specifically to send his own works, clearly expecting that without such prompting Schlick would be too modest to do so (Doc. 40). Einstein’s review of Reichenbach’s book (Doc. 96) was ultimately positive, but engaged with the details of the book much less than the review of Meyerson’s book. The point that Einstein singles out for praise is the appendix, reiterating the same point that he had emphasized again and again to Meyerson and on which he and Reichenbach had previously agreed, namely, “the groundlessness of the thesis…