About Harold Bohr's death and birth of Aage Bohr's child.

W. Pauli informs that he has reported in Hamburg (probably at Hamburg University). No mention of the subject.

Pauli says that Green will coming soon.

Pauli replies to Pais' letter about W-space. He talks about the connection of Pais' theory with those of Kaluza and Klein. He writes about the geometrization of meson-nucleon forces.

Pauli writes about a paper by Villars and himself for the Einstein issue of the Rev. Mod. Phys. which will be sent off in a week. He asks if a certain result is already known. He writes about self-energy and "self-stress" of the electron. He also mentions Kramer's state of health.

Pauli writes about Kramer's death (24 Apr) and their friendship. He writes of his forthcoming visit to Copenhagen (meson conference).

Pauli talks about the sign of vacuum polarization. He says that the vacuum polarization charged auxiliary particles must be introduced (positive and negative, zero spin).

Pauli says that the difference of opinion about the sign of vacuum polarization is resolved. He writes about the work of his doctorands, and about his debate with Born on the properties of a certain operator.

Pauli criticises Jung's theory of the closed circle, but in spite of this he thinks that the concept of the Collective Unconscious is correct and plausible. He gives a detailed discussion of this concept and modifications. He makes parallels between micro-physics and psychology of the unconscious which deal with an invisible reality. He writes about Bohr's political activity and the reaction to it.

Pauli talks about the Copenhagen conference and its program.