Lüders corrects his letter of 16.12.57 : Pauli did overlook an exchange relation; Lüders lists all possibilities.

Lehmann, Symanzik and Zimmermann reply to Pauli's letter, in particular about Lee's model and the appearance of "ghosts".

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.

Klein wants Pauli to render his encyclopedia article consistent with Kottler's.

Historical remarks from Klein about Poincaré's note in "Comptes Rendus 146" and in "the origins of relativity".

Klein's reply to Pauli's letter of 4 May, and detailed comments on several passages in the encyclopedia.

Klein's further remarks and suggestions about the encyclopedia article.

Klein's comments on the proofs of Pauli's encyclopedia article.

A few more suggestions from Klein for changes to Pauli's encyclopedia.