6 0 6 D O C U M E N T 4 1 3 F E B R U A R Y 1 9 2 9 Abdruck folgender Sätze: „Das Buch hat mich sowohl als Versuch der Durchfüh- rung strenger Kausalität auf die Seelenvorgänge, als auch wegen seiner pädagogi- schen Qualitäten ausserordentlich interessiert. Ich werde es besonders jüngeren Menschen empfehlen.“ Mit ausgezeichneter Hochachtung TLC. [48 542]. Addressed “Herrn Obering. Hans Stürmer Würzburg Maistr. 6/0.” [1] Stürmer was a German engineer in Würzburg. [2] For Stürmer’s request, see Abs. 910. 413. From Luther Pfahler Eisenhart [Princeton,] February 23, 1929 My dear Dr. Einstein: I wish to thank you for sending me a copy of your paper.[1] Also, I appreciate the kind note which you wrote me containing a reference to my work dealing with this subject.[2] It is not surprising that you worked out these matters independently because you were approaching the matter from the physical point of view. I was sorry to learn that you have not been well and I hope that you will soon be restored to health. I am sending you a copy of the book to which Weitzenbock refers.[3] The first chapter of the book deals more particularly with the asymmetric linear connection, and on page 48 you will find the particular connection which you have taken as a basis of your theory.[4] I presented the mathematical aspects of your theory to our seminar a week ago, and I am hopeful that it will be found that your theory accounts for the physical phenomena involved. With best regards, I am Sincerely yours, L. P. Eisenhart TLS. [9 207]. On letterhead “Princeton University Princeton New Jersey.” A TLC is also available. [9 208]. [1] Einstein 1929n (Doc. 365). [2] Einstein had acknowledged Eisenhart’s contributions to the theory of distant parallelism in Doc. 394. [3] Eisenhart 1927 (see Doc. 246 or Weitzenböck 1928 for the reference to this book). [4] Infeld had already alerted Einstein to this particular treatment of the teleparallel connection in Doc. 279.