Copy letter from an unknown correspondent, to Mr Collings, 172 Strand 'Herewith about 20 sheets ^(24 shts [sheets] altogether H.H.W.)^ of dias [diagrams] for Phil. Trans. ['Philosophical Transactions of the Royal Society'] Brunton & Cash [Thomas Lauder Brunton and John Theodore Cash]. Please send estimate by Wednesday. The apparatus shd [should] be b. on .w. [black on white] the photographic curves w. on. b. [white on black]. The plotted curves ought perhaps to be litho'd [lithographed], but you can include them in your estimate to be done in whatever style you advise, probably w. on. b'. 15 June 1891