Copy letter from Herbert Rix, to Mr G S Waterlow, Finsbury Stationery Works, Clifton Street, E.C. Rix states that Sir Howard Grubb believes that Waterlow would reproduce the enclosed photograph [not included] with the required delicacy, for insertion in the text of a paper by Dr William Huggins to be published in 'Proceedings of the Royal Society'. The reason why particular delicacy is required is the shading to a point of dark horizontal bands which are noted as the 'pith of the communication'. Rix will be glad to have their estimate if Waterlow believes they can undertake the work. 12 April 1889