Letter from John W. Evans, Secretary of the Conjoint Board of Scientific Societies, to the Secretaries of the Royal Society Informs the Royal Society of a Resolution made by the Geological Committee of the Conjoint Board of Scientific Societies: 'In the opinion of this Committee is it desirable that a Conference of representative Geologists of Allied and Neutral Countries should be held in London at an early date, at which the question of an International Union in Geology should be discussed.' 29 November 1920