Copy letter from Robert William Frederick Harrison, to Sir William de Wiveleslie Abney, Fellow of the Royal Society, Board of Education, South Kensington, S.W. All the pictures not yet photographed were taken down some time ago and have been awaiting further operations. It is very desirable the pictures should be re-hung before the beginning of the session a month hence. Asks if Abney proposes continuing the photographing of these pictures this vacation. 20 September 1900