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Reichenbach refers to Pauli's article on hidden parameters. He expresses satisfaction at Pauli's strong rejection of this idea. He comments on the method of his argument against it.

Peierls replies to two letters by Pauli. He comments Pauli's calculations as regards the non-local field theory, and on his view about the use of form-factors which may destroy the gauge invariance.

Fierz defends his position that entropy is the "measure of information" obtained by an observer. He examines information obtained in classical theory from observation of changing macrostate; in quantum theory from observation of microstate that is then generalized to a macrostate. He claims entropy exists only with observation.

Fierz summarizes findings on entropy and observation in 5 "theses".

Møller and Kristensen reply to Pauli's letter and manuscript. They writes about details of the mathematical development of their theory, with special reference to the work of Claude Bloch.

The THC collection contains documents on the creation of CERN, and about the organisation and activities of the Theory Group in Copenhagen. It includes correspondence, reports and memoranda. The TH collection contains the files of Jacques Prentki, Jacob Maurice and John Ellis on the Theory Division. Jacques Prentki: joined Bernard d'Espagnat, the first CERN theorist in January 1955. He came from Leprince-Ringuet's Laboratory at the Ecole Polytechnique in Paris. He was nominated leader of Theory Division from 1966 to 1969 and from 1976 to 1981. His field of interest was QCD (Qunatum Chromodynamics), and grand unified theories. Maurice Jacob: was head of TH division from 1982 to 1988. A tireless research compaigner, he has also served as President of the French Physical Society in 1985 and as President of the European Physical Society from 1991 to 1993. Maurice also left his mark on scientific publishing, where he worked with leading North Holland/Elsevier journals from 1968 to 1985. His field of interest was particle physics, space physics, physics and society. * John Ellis: joined CERN in 1973. He was the leader of the TH Division from 1989 to 1993. John Ellis published over 700 scientific articles in particle physics and related areas of cosmology and astrophysics. His research interests included the possible experimental consequences and tests of new theoretical ideas such as gauge theories of strong and electroweak interactions, grand unified theories, supersymmetry, and string theory. He was awarded the Maxwell Medal of the Institute of Physics in 1983 and was elected a fellow of the Royal Society in 1985. Honorary Doctorate, University of Southampton, 1994. It includes administrative, personnel, technical subjects (correspondance, notes, reports, documents on rules and regulations, staff recommandations, fellows and visitors, PS improvement programme…)