Copy letter from Herbert Rix, to Dr Mott 'Dear Sir, It has been decided that the three negatives shall be done again, the Cambridge Compy [Company] & the Royal Society each to pay half the expense. I return to you by this post the three proofs. Please send them to Cambridge with precise instructions as to the alterations which are to be made. Yours truly Herbert Rix Asst Sec RS [Assistant Secretary, Royal Society]'. 2 December 1891