1931 April 10 meeting of the Royal Astronomical Society

1931 April 15 meeting of the Royal Meteorological Society

1931 April 29 meeting of the British Astronomical Association

1931 December 11 meeting of the Royal Astronomical Society

1931 December 16 meeting of the Royal Meteorological Society

1931 December 30 meeting of the British Astronomical Association

1931 February 13 meeting of the Royal Astronomical Society

1931 February 18 meeting of the Royal Meteorological Society

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