Bronchopneumonia is recognized as the most fatal complication of measles. While the pathology of the condition has been thoroughly investigated, there is yet much to learn regarding the etiology and the more minute pathologic changes which occur in the tissues. Many epidemics of bronchopneumonia following measles differ markedly in their clinical and pathologic features, and it is impossible to believe that such epidemics are always due to the same etiologic factor.
The occurrence of an epidemic of measles in one of the posts of the Department of California, many of the patients being sent to the U. S. Army General Hospital at San Francisco for treatment, and the complication of this condition by bronchopneumonia which occurred in a considerable proportion of these cases, has given me an opportunity to study minutely the pathology of this condition. In all, 89 cases were sent to this hospital for treatment; in 12 cases, nearly 13.5