Abstract
1. An outbreak is described of fatal epidemic enteritis due toB. dysenteriaeSonne which occurred in the autumn, 1928, in the infant wards of a hospital in Glasgow.2. The clinical histories of two fatal cases are given.3. The bacteriological and immunological examination of two strains ofB. dysenteriaeSonne is described.4. The results are given of a series of animal inoculations undertaken to study the virulence ofB. dysenteriaeSonne and the nature of the lesions which it produces. To these are added the results of certain feeding experiments.