Questions in connection with the preparation of a new edition of Pauli's encyclopedia article on relativity.

Request from Pauli for offprint and notes concerning relativity.

The letter contains a short remark on self-energy and a longer one meson-theory, with reference to papers by Schwinger and Oppenheimer.

Pauli makes a remark on a note by Bethe on self-energy in: Physical review, 55, 681, 1939.

Pauli writes that there could be some possibilities of a position in the USA for Bhabha. He is publishing his Solvay report of 1939 in the Rev. Mod. Phys. Observations on Christy and Kusaka's calculations on the development of the shower and the pseudo scalar meson theory.

Pauli made some additions to Bhabha's paper for the Bohr Festschrift. He says it is impossible to quantize the Bhabha equation according to Fermi-Dirac statistics without using an indefinite metric in Hilbert-space. Pauli says he will know his future plans better in six months, including the possibility of a visit to the Tata-Institute (India).

Pauli thanks him for his congratulations concerning the Nobel ceremony and he reports on the physics meeting in New York at the end of January. Pauli is going on a trip with his wife in four weeks to Europe.