JF Ptak Science Books Quick Post
I wanted to reproduce Wolfgang Pauli's letter of 4 December 1930--in it he thinks very widely of missing stuff, of some of the basic bits of the universe, in a rather open and guarded way, about the ghost of the neutron. He didn't feel very comfortable with his ideas yet, at least for professional consumption--that would have to wait another three years when it was discussed at the 7th Solvay Conference (1933) and another three when it first came into print (1936). The name "neutron" would also be changed to the familiar "neutrino" ("little one") by Enrico Fermi in 1933 to differentiate it from the much larger nuclear particle discovered the year earlier by James Chadwick--Chadwick's paper was published in Nature, which would reject Fermi's paper in 1934 as too radical a leap.
[Source: Exhibition of the ETH-Bibliothek to the occasion of the 100th birthday ofWolfgang Pauli http://www.library.ethz.ch/exhibit/pauli/neutrino_e.html]