A typing scheme forS.virchow using 5 phages is described. Since all strains ofS.virchow proved lysogenic it was necessary to propagate the phages on lysogenic cultures. Strains from Denmark, Nigeria and Sweden fell with one exception in each case, into characteristic and distinct types. The majority of English strains were of yet of another phage type. Various physico-chemical reactions of the phages are recorded. The use of coloured medium proved of much value in the recognition of phages.