Copy letter from Herbert Rix, to Mr Collings Asks for estimate for two blocks cut to the enclosed diagrams [not attached]. They are for the Phil. Trans. [Philosophical Transactions of the Royal Society] and are to be done in the best style, cross-hatched and made as soft as the best the Messrs did for Professor Lockyer. Any questions should be directed to Professor Church, Shelsley, Kew. 29 June 1892