Letter from Arthur Compton, Laboratoire de M. Gabriel Bertrand, Institut Pasteur, 28 Rue Dutot, Paris, to the Assistant Secretary, the Royal Society, Burlington House Making application for an extension, to a second year, of his Mackinnon Studentship. The Studentship of £150 forms his main source of income, with a supplementary amount of £100 from a British Medical Association Scholarship. Without that income it would be impossible for him to continue his investigations. He encloses a brief report on what he has done since his appointment, citing Professor Gabriel Bertrand as a referee. His report is marked confidential, as it treats of original and as yet unpublished research, especially the section 'Explanatory Notes'. 3 July 1920