During 1927 Massachusetts was visited by an epidemic of infantile paralysis next in severity to that of 1916; 1,189 cases were reported. The Harvard Infantile Paralysis Clinic at the Children's Hospital is treating more than half this number, or 636, and I shall analyze these cases, not only to record the different phases of the attack but to have an early record in order that we may follow the cases for further study of their progress.
Owing to the interest and cooperation of the physicians in the different towns and cities, we have been able to make the initial examination of patients in this epidemic much earlier than in previous years. The average interval between the onset of disease and the first examination in this study has been six weeks. However, in spite of the fact that these examinations took place on an average of only six weeks after the