Glaser writes of his attempts to overcome the difficulty of "ghosts" in quantum electrodynamic field theory.

Schafroth writes about his newest results in supraconductivity. He makes some personal remarks about the institute he is leaving now and about his trip to Europe from last summer.

Bender talks about Tornier's reply to Pauli's remarks and sends a copy to Pauli.

This is a reply to a letter from Pauli and to Schafroth's criticism of 18 February, as regards his "Critic of the relavistic thermodynamics".

Klein writes about his discussion with Sommerfeld on the use of Einstein's notation "Lorentz, Amsterdam Verlag, 1916" and about Klein's inability to work on relativity for a year, and his receipt of Pauli's manuscript.

Kröner replies to Pauli's questions concerning the infinity of space. He writes of the participation in the intelligible world of Greek science and its destruction in Christianity. He writes about Burtt's book and its significance.