Copy letter from Robert William Frederick Harrison, to R G Skerrett, Universitat Strasse 3b, Berlin, N.W. Cannot trace any paper on 'The Motion of a Perfect Fluid' in 1899 or adjacent years. There is a paper by Hele-Shaw in 'Philosophical Transactions [of the Royal Society]' for 1900 on Lines of Induction in a Magnetic Field. Asks if this is what he requires. The second paper by L Hill and M Greenwood on 'The Influence of Increased Barometric Pressure on Man', read on 22 December, will be published in 'Proceedings [of the Royal Society]' and will be obtainable in a week or two from Messrs Friedlander & Sohn. Has no trace of a paper by the same authors on 25 May. 2 January 1907