Letter from Andrew Wilson, University College London, Pharmacological Laboratory, to Henry Barcroft, Physiological Laboratory, Queen's University, Belfast Informs Barcroft that 'we used intra-arterial injections of acetyl choline in men in the investigation of myasthenia gravis'. Were mostly interested in its nicotine effects but also recorded the muscarine effects. Will send an abstract of their protocols. 9 December 1946