1. A two-year follow-up study of 1039 cases of dementia præcox treated by the pharmacological shock method in the New York state hospitals is presented and discussed.2. It is recommended that statistical compilations include all the factors that seem to be related to the outcome of treatment.3. Uniform recording of the treatment based upon the neurological signs of the insulin effect is advocated.4. Uniform criteria for the interpretation of the results of treatment should be established.5. The value of metrazol as a part of the pharmacological shock treatment is discussed.