BY means of a grant from the World Health Organisation, the following were able to meet to discuss a notation for the Lewis and Lutheran blood-group system : P. H. Andresen, Universitetets Retsmediciniske Institut, Copenhagen ; S. T. Callender the Radcliffe Infirmary, Oxford ; R. A. Fisher, Department of Genetics, Cambridge ; R. Grubb, Bakteriologiska Institutionen, Lund ; W. T. J. Morgan, Biochemical Department, Lister Institute, London ; A. E. Mourant, Ministry of Health, Lister Institute, London ; M. M. Pickles, Pathological Department, Radcliffe Infirmary, Oxford ; R. R. Race, Medical Research Council, Lister Institute, London. The appended report has been prepared.