Pauli thanks Elsasser for his book "The Physical Foundation of Biology" and he discusses a few of its topics.

Pauli mentions his recent experiments in Heidelberg von Stek about polarization of Beta-electrons of RaE.

Pauli acknowledges receipt of Heisenberg's manuscript and makes a few comments.

Heisenberg replies to Pauli's lettter and asks about the behaviour of the operator $\chi$ on the light cone.

Pauli writes about Miss Meitner's older contributions to the beta-decay problems, mentioned in Pauli's German paper on the neutrino's history. He makes a short condensation of his paper, beginning with Chadwick's paper of 1914 and ending with Meitner's and Orthmann's paper of 1930. Pauli comments on the situation after Chadwick's discovery of the neutron (1932).

Pauli writes about von Steck's results in Heidelberg.