Pauli invites Hulthén to contribute to the Bohr issue, published in: Review of Modern Physics: (1945), Vol. 17.

Pauli asks Bhabha for a paper for the Bohr Festschrift in the Rev. Mod. Physics. Pauli's plans for the future are still open. He may return to Zürich. Last autumn Pauli gave six lectures on meson theory in Cambridge, Massachusets. There is a discussion on Dirac's new effort to eliminate the second kind of divergencies by introducing an hypothetical world different from the actual world.

Pauli writes about reports on efforts to find new positive particles. He writes about the situation in Switzerland during last winter and about the situation in Holland. He writes about the preparation of the Bohr-Festschrift.

Pauli thanks for a paper sent in honour of Bohr's 60th birthday. He cannot accept Dirac's theory from the standpoint of physics because it leads to results contradicting the required correspondence to the classical theory.

Pauli's letter deals with contributions, received and not received from physicists of various countries to the Bohr-issue. He talks about an invitation to visit Russia.

Comments on Bhabha's writings on wave equations for particles with higher spin. Bhabha asked Pauli to send his corrections to the editorial office of the Rev. Mod. Phys for printing.

Pauli thanks Uhlenbeck for the congratulations on his Nobel prize. He writes about the notes of his MIT lectures.

Pauli reports on the stops during his journey to Zurich, Powell's doubts about Amaldi's results, problems of Wentzel and Villars with "strong coupling theory", and Dirac's latest views. He criticizes Gustafson's work, Peng's removal of divergences in meson theory and Heisenberg's S-matrix theory.

Pauli replies to Pais' question about the transformation of Hamiltonians.

Pauli thanks Källén for his manuscript and letter. He makes a comparison of Källén's and Yang's results. He talks about results by Rohrlich for the case of charged scalar mesons in interaction with the quantized electromagnetic field. He also talks about results by Peasler and Kiroshita and about nu mber for charged vector mesons.