[Letter] 1930 Oct 2, Observatory, Cambridge [to] 'Vice Master' / A.S. Eddington. [1p., holograph signed. He does not intend to seek re-election to the Council of the Senate in November. He has been glad of the opportunity 'of becoming familiar ... with the inner councils of the University', but 'regarded it all along as an office I could only undertake for a limited time']