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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.

Pauli gives additional remarks on Dyson's calculations.

Pauli makes a comment on a paper by Dyson, which is the first of a series of papers.

Pauli writes about the renormalization method which does not work so well for general interaction in quantized field theory as in the case of positron-quantum electrodynamics.

Pauli writes about the talk he had with the German physicist M. Knoll on extra sensory perception (ESP), on different classes of synchronistic phenomena, spontaneous and induced events and on the analogy of a discovery of a law of nature and the induced synchronicity.

Heisenberg explains his ideas about the "Vertauschungsrelationen" (interchange relations) in his paper. The real problem arises after the introduction of an interaction. This belongs to the general question: which invariance conditions are fullfilled by the interaction energy? He is not as pessimistic as Pauli, the whole question boils down to the problem of finding suitable expressions for interaction out of combinations of wavefunctions which obey regular interchange relations. One has to begin by forming models for unitary theories which afterwards will split up in theories for single particles. The postulate of "hermiticity" is connected with the conservation law for nucleons.

Matthews discusses renormalization of "spinless meson-nucleon-photon mixture" and the work of Salam and Dyson.

Pauli makes more comments on a paper written by Heisenberg.