1931 February 25 meeting of the British Astronomical Association

1931 February 6 geophysical discussion

1931 January 21 meeting of the Royal Meteorological Society

1931 January 28 meeting of the British Astronomical Association

1931 January 9 meeting of the Royal Astronomical Society

1931 June 12 meeting of the Royal Astronomical Society

1931 June 17 meeting of the Royal Meteorological Society

1931 June 24 meeting of the British Astronomical Association

1931 March 13 meeting of the Royal Astronomical Society

1931 March 18 meeting of the Royal Meteorological Society

1931 March 25 meeting of the British Astronomical Association

1931 May 1 geophysical discussion

1931 May 20 meeting of the Royal Meteorological Society

1931 May 27 meeting of the British Astronomical Association

1931 May 8 meeting of the Royal Astronomical Society

1931 November 13 meeting of the Royal Astronomical Society

1931 November 18 meeting of the Royal Meteorological Society

1931 November 23 meeting of the British Astronomical Association

1931 November 27 geophysical discussion

1931 October 28 meeting of the British Astronomical Association