Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Professor [Samuel Walter Johnson] Smith, FRS Refers to the paper by T. L. Ibbs, 'Some experiments of thermal duffusion', that Professor [Samuel Walter Johnson] Smith communicated to the Society. Explains that the referee report suggested that Figures 6, 7 and 8 might be combined in one, and that the enclosed note by Professor [Sydney] Chapman might be added as an addition to the paper. Asks Professor Smith to enquire with the author as to whether these changes are possible. 5 April 1921