Copy letter from Herbert Rix, to Mr Collings, 173 Strand 'Please take note that it is Prof. Horsley's [Professor Victor Horsley] intention to add lettering to his figures. As some of them will very likely be done by process, it is necessary to bear this in mind that the lettering may be added before they are put in hand. I will let you hear shortly whether the estimate is accepted'. 21 May 1891