Wu thanks Pauli for his letter and interesting information. He writes about a conference on weak interactions where new experimental results were reported on $\pi^{-}e$ decays, $\mu^{-}$ capture in $C^{12}$, and on lepton decay.

Landau agrees with Pauli on Heisenberg's theory. He makes remarks on Lee's model and future theory.

Gürsey gives a detailed view on the work he has done in the past month in elementary particles physics and announces a paper.

Wu thanks Pauli for a correction he made to historical paper. He writes about an occurence with the Queen of Greece on her official visit to the Pupin Physics Department.

This postcard gives some details about Pauli's arrival in Denmark

This letter gives the results of Blokhintzev's calculations on the wave equation of a field interacting with heavy particles.