These observations will be limited to the cases of paralysis that are the result of cerebral embolism, hemorrhage or thrombosis.
These three pathologic conditions constitute the vast majority of the cases. The records of Cook County Hospital for 1903 show four cases of embolism, sixtyfive cases of hemorrhage and twenty cases of thrombosis. In thirty-two cases of cerebral paralysis the pathogenesis was in doubt. The records of the year 1904 show six cases of embolism, sixty-nine cases of hemorrhage, thirty-one cases of thrombosis and thirty-four cases in which the pathogenesis was doubtful.
Differentiation was made either in the postmortem room or by a medical staff very skilled in diagnosis, and they differ somewhat from the ordinary published records of such cases. They show an immense preponderance of hemorrhage, and this should be remembered at the bedside when an effort is being made to work out a diagnosis in any given