Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Professor [Sydney] Chapman, FRS Thanks Professor [Sydney] Chapman for his statement as to [J. E.] Jones' analysis. As regards Professor Chapman's proposed book [unspecified], notes that he feels 'nothing but approval for the plan'. Further notes that, if materialised, he could shorten certain chapters from his own book on the same subject and replace them with references to Professor Chapman's. 1 November 1921