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Pauli talks about Felix Bloch's interest in Schafroth's work on the ideal Bose-gas. He talks about his study on Lee's paper (in: Phys. Rev. : 95 (1954), pp.1329).

Pauli wants to write first to Lee before the proposed paper by Pauli and Källén is written. He writes on a definition of a "ghost state". He expresses doubts about the Tamm-Dancoff approximation in the case of more general systems. He makes some mathematical remarks.

Pauli writes on the difficulties of quantum electrodynamics and the various attempts to overcome them. Pauli expresses doubts about the renormalization method.

Heisenberg comments on Pauli's calculations on the Lee model. He writes about his own work, especially on Bosons of zero mass in his model.

Pauli thanks Wightman for his letter of the 6th January 1955 which settles all important mathematical questions.

Pauli thanks Källén for the manuscript. He writes about the Tamm-Dancoff method and some known negative attitude towards it. Small changes in the manuscript and the re-writing of the appendix.