Copy letter from Robert William Frederick Harrison to Sir James Dewar FRS 'Dear Sir James, Soiree. At a recent meeting of the Soiree Exhibits Committee it was suggested that an exhibit might be made at the Soiree on May 25th, illustrative of the spectra of luminous bacteria. The Committee though that, in the first instance, a communication relative to the matter should be made to you. Perhaps you will be good enough to let me have a line with regard to the feasibility of such an exhibit.' 6 April 1910