Letter from Howard Walter Florey to B F Martin, Anatomy Department, University of Sheffield Would like prints of reaction described in Martin's letter to Nature, 25 December 1954, and permission to reproduce these in account of Brunner's glands and other mucus-producing cells of the gastro-intestinal tract - found only trace of lipase in rabbits' duodenal secretion - comments on Villemin's work describing Brunner's glands in horse - Martin might see if serous cells of horse contain lipase - would like reprint of Martin's note. 10 January 1955