Copy letter from Herbert Rix, to Mr James Thin, 54-55 South Bridge, Edinburgh 'The two Water Research Reports are not separately published, but they occupy entirely the following numbers of "Proceedings" ['Proceedings of the Royal Society'], No. 310, price 3/- (First Report); No. 323, price 5/- (Second Report). 25% dis [discount] to you. HR'. 19 February 1894