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Heisenberg writes on excitation times and line widths.

Heisenberg asks for Pauli's opinion on his Zeeman effect paper.

Heisenberg writes about progress in quantum mechanics, Born's and Jordan's contribution and mathematical representation of the new formalism.

Heisenberg writes about the quantum conditions for several degrees of freedom.

Heisenberg thanks Pauli for his book (Hand-Buch-Article). He writes against Schrödinger's conception which throws all quantum theoretical phenomena over board and about Wien's agreement with Schrödinger's attitude.

Heisenberg expresses his comments and doubts about Pauli's statistical theory. He has more throughts about velocity-position indeterminacy. He writes about his ideas on ferromagnetism and about intensity change in band spectra.

Heisenberg replies to some questions from Pauli.

Heisenberg writes about Pauli's remark on the interaction of the electron with itself and its consequences for the theory and on possible ways to eliminate the difficulty.

Heisenberg writes about the "Vertauschungsrelation" in the theory of holes.

Heisenberg makes some remarks on Fermi's paper. He writes on his matrix elements for pair creation and gives some calculations about the exchange energy of proton and neutron.