Copy letter from Robert William Frederick Harrison, to Professor John Newport Langley, Fellow of the Royal Society Sent the one block for the illustrations of Langley's Croonian lecture which Langley marked for improvement to the engraver to have the necessary alterations made and encloses a revised proof [not enclosed]. Langley's request to have the figures in the text instead of on a plate was referred to Dr [Joseph] Larmor, who agrees to their being separated, but if they do not come out so well on the printing paper, the Society shall not be responsible. A revise in pages shall be sent. 3 August 1906