About various topics concerning Källén, Symanzik, Jordan, Krolikowski, etc.

Pauli invites Thellung to the X mas party of his institute. He writes about Källén's work on renormalization.

Pauli offers Thellung an assistant ship from the 1st April 1953. He writes about Källén's further work.

Pauli writes about his travel plans to Les Houches.

Pauli congratulates Thellung on his engagement and professorship. He expresses his satisfaction about the choice of his new research subject : heat conductivity at low temperatures. He makes a short report on his Mediterranean trip.

Pauli urges Thellung to finish his doctoral thesis.

Pauli comments on an oral discussion with Thellung about the validity of "Vertauschungsrelationen" in certain fields.