Letter from Howard Walter Florey to J A H Giffard, 3rd Earl of Halsbury, National Research Development Corporation, Tilney Street, London Thanks for letter - from what he hears from Macfarlane, seems that question of the Radcliffe blood cell counter is settled - says Macfarlane and a colleague feel very frustrated at having wasted so much time elaborating this instrument, which is not now to be used. 15 March 1955