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Weisskopf writes about Pryce in New College, Oxford, who is interested in ESP. He believes it still has to be proved that the specific entropy in living beings diminishes with evolution . He doesn't believe in the possibility of a numerical evaluation of evolution-probabilities.

Weisskopf writes about Feynman's and Peterman's theory on the proton and neutron mass difference.

Weisskopf gives a proof for the rule that induced that charges always have the same sign.

Weisskopf replies to Pauli's question about certain results of Schwinger's papers on the theory of quantized fields.

Weisskopf replies to Pauli's letter of the 27th January 1957. He writes about the two components in Dirac's equation and its possible consequences.

Weisskopf writes about Heisenberg's talk on his theory and about the doubts on its results.

Weisskopf comments on the copy of Pauli's letter to Landau. He expresses doubts on the introduction of two fields.

Walden gives the origin of his claim that Mendeleev came to the periodic table through dreams. He suggests how it may have happened.

Vrkljan sends a reprint on the problem of neutron and proton.