Letter from C J Clay and Sons, The Cambridge University Press Warehouse, Ave Maria Lane, London, to [Robert William Frederick] Harrison, The Royal Society, Burlington House 'Dear Sir, We enclose herewith our cheque for £7.19.0 being the amount due to you on your publishing a/c July 1st 1902 to June 30th 1903. Publication: Kindly sign and return the form of receipt at your early convenience. We are, dear Sir, Yours faithfully, C. J. Clay and Sons'. 27 January 1904