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Clusius refers to quotations on atoms made by several figures from the late 19th century. He quotes Marignac.

This letter from Casimir is accompagnied by an offprint by Casimir and B L van der Waerden "Algebraischer Beweis der vollständigen Reduzibilität der Darstellungen halbeinfacher Liescher Gruppen" (in: Math. Ann. : 111 (1935), pp.1-12). The letter contains a short reference to mathematical problems, experimental results on supraconductivity and personal remarks on Kronig.

Caldirola replies to Pauli's question about time dilatation.

Budini has not yet reached a satisfactory result as regards the orthogonality of the eigen-solutions of an equation connected with the regular representation of the homogeneous Lorentz group.

Budini thanks Pauli for his letter. He is now convinced that the eigen-functions in question are not orthogonal to each other.