6 4 D O C . 3 1 C A L C U L A T I O N S [1]Dated by the fact that the calculations are written on the back of Abs. 56. [2]The formulation of the affine field theory found in Einstein 1923e (Vol. 13, Doc. 425) in terms of a Hamiltonian principle was first given in Einstein 1923h (Doc. 13). Calculations pertaining to the variational formulation of this paper can be found in Einstein’s Japan diary (Vol. 13, Doc. 418, [p. 43]). The variational calculations in the present document appear to be related to the variational principle as given in Einstein 1923n (Doc. 52), eq. (13). [3]This equation is the starting point for an experimental investigation carried out by Hermann Mark in late summer 1923 see Doc. 152.