CHRONOLOGY, JUNE-DECEMBER 1905 619 Drawn from a Thermodynamic Equation" (Vol. 2, Doc. 18) Emile Mathias, "The Constant a of Rectilin- ear Diameters and the Laws of Corresponding States" (Vol. 2, Doc. 19) Max Planck, "On Clausius' Theorem for Irreversible Cycles, and on the Increase of Entropy" (Vol. 2, Doc. 20) Edgar Buckingham, "On Certain Dif- ficulties Which Are Encountered in the Study of Ther- modynamics" (Vol. 2, Doc. 21) and Paul Langevin, "On a Fundamental Formula of the Kinetic Theory" (Vol. 2, Doc. 22). June 30 "On the Electrodynamics of Moving Bodies" (Vol. 2, Doc. 23). July 27 Einstein's petition to receive the doctorate is approved by the Philosophical Faculty II of the University of Zurich. late summer Visits Belgrade with wife and son and spends time in Ujvidek (now Novi Sad). second half of September Publishes reviews of Heinrich Birven, Fundamentals of the Mechanical Theory of Heat (Vol. 2, Doc. 25) Auguste Ponsot, "Heat in the Displacement of the Equi- librium of a Capillary System" (Vol. 2, Doc. 26) and Karl Bohlin, "On Impact Considered as the Basis of Kinetic Theories of Gas Pressure and of Universal Gravitation" (Vol. 2, Doc. 27). September 27 "Does the Inertia of a Body Depend upon Its Energy Content?" (Vol. 2, Doc. 24). first half of November Publishes reviews of Georges Meslin, "On the Constant in Mariotte and Gay-Lussac's Law" (Vol. 2, Doc. 28) and Albert Fliegner, "The Efflux of Hot Water from Container Orifices" (Vol. 2, Doc. 29). second half of November Publishes reviews of Jakob Johann Weyrauch, An Out- line of the Theory of Heat. With Numerous Examples and Applications. 1st part (Vol. 2, Doc. 30) and Albert Fliegner, "On the Thermal Value of Chemical Pro- cesses" (Vol. 2, Doc. 31). November 21 Receipt in the amount of 18 francs, for four private les- sons in electricity given to Lucien Chavan from 24 Oc- tober to 21 November 1905. December 19 "On the Theory of Brownian Motion" (Vol. 2, Doc. 32).