Copy letter from Herbert Rix, to Professor James Dwight Dana, New Haven, Connecticut [USA] 'Dear Sir, You probably did not understand that the three volumes which you have promised to purchase will not be published for some time to come: the MS [manuscript] has only recently been sent to press. Under these circumstances it seems better that I should return you your cheque as it may be twelve months before we need ask for any payment. I am, your obedient servant, H Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 25 April 1889