Copy letter from Robert William Frederick Harrison, to Miss Sollas, Newnham College, Cambridge Harrison confirms receipt of the corrected proof of Sollas' paper, 'On the Identification of Chitin by Its Physical Constants', but prior to sending it to the printers, has been directed to highlight a referee's suggestion that a brief summary of the main conclusions be added at the end of the paper and asks that she supply such a summary. He returns the proof for this purpose. 11 July 1907