628 CHRONOLOGY, MAY-SEPTEMBER 1911 May 18 May 24 June 2 June 21 July 25 July 31 August 11 August 23 August 24 September September 7 September 20 September 25 and 27 On the Ehrenfest Paradox. Comment on V. Varicak's Paper" (Vol. 3, Doc. 22). Delivers a lecture on "Das Relativitätsprinzip" to the Deutsche Gesellschaft für Bohemia-"Lotos," in the Physics Institute of the German University. Receives first installment of annual grant of 800 crowns for the Institute of Theoretical Physics. Provenance: Geschäfts-Protokollbuch 1910/11, CzPCU, no. 1344. "On the Influence of Gravitation on the Propagation of Light" (Vol. 3, Doc. 23). "Supplement to the Correction" (Vol. 3, Doc. 21). The summer semester at the German University ends. Edouard Herzen, in the name of Ernest Solvay, an- nounces the intention of reproducing the papers to be delivered the end of October at the Solvay Congress. He requests that participants submit them to Walther Nernst at least two weeks in advance of the meeting. Prove- nance: BBU, 11Z, dossier 1er Conseil de Physique, no. 1735. Takes oath of office as professor at the German Univer- sity. Begins negotiations with the University of Utrecht on a call there. The salary under discussion is 5000-6000 guilders. Heinrich Zangger visits Einstein in Prague and the subject of a call to the Swiss Federal Polytechnic (ETH) is broached. Receives annual sum of 400 crowns for directing the physics seminar at the German University. Provenance: Geschäfts-Protokollbuch 1910/11, CzPCU, no. 1744. Named to a committee to select a successor to the mathematics chair of Josef Grünwald. Provenance: Geschäfts-Protokollbuch 1910/11, CzPCU, no. 1780. Contributes discussion remarks to the lectures of Walther Nernst, Arnold Sommerfeld, and Heinrich Rubens at the Karlsruhe meeting of the GDNA (Vol. 3, Doc. 24).