Klein writes about the paginated proofs of the article and gives more suggestions.

Klein writes about his discussion with Sommerfeld on the use of Einstein's notation "Lorentz, Amsterdam Verlag, 1916" and about Klein's inability to work on relativity for a year, and his receipt of Pauli's manuscript.

Klein's editorial remarks on Pauli's relativity article : notation, use of Lorentz group and clarity.

Kottler writes about the Christoffel symbols.

Kottler writes about the expressions for the velocity 4-vector, for the Christoffelsymbols, the pseudotensors and the differential operators of special velocity.

Kottler thanks Pauli for his letter and his readiness to deal with his work on relativity.

Kottler writes about some suggestions of Pauli as regards the treatment of relativistic line elements.

Møller and Kristensen send notes from a colloquium on nonlocal theories. They relay as invitation from Bohr to visit Copenhagen for the CERN Study Group.

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.

Möller and Kristensen reply to Pauli's question about the polarization of the vacuum by an external meson field.