Thirring writes about Källén's inconsistency proof for quantum electrodynamics.

Thirring corrects a mathematical error in his letter of the 31st March [1955]. He applies Thirring's model to Maxwell's case and discusses an alternate model.

Thirring writes about the critics of the Russian physicists about the paper by Hüda and Machida .

Thirring gives the results of his calculations in connection with Lee's model (convergence of a perturbation series).

Thirring sends the continuation of his work on electrodynamics.

Thirring discusses papers on renormalization by Klein, McCormick and by Cooper.