Copy letter from Herbert Rix, to Lord William George Armstrong The printers assure Rix that the whole 250 copies have been sent to Armstrong and think that Armstrong's misapprehension arises from the fact that only 150 copies are charged for in their account to Armstrong. The Royal Society always pays for 100 copies, the author paying for any number over and above this. Asks to know if 250 copies were actually not received. 10 December 1892