The objection that the Binet tests do not analyze the source of the child's mental defect is of course important if one were considering whether a better scale might not be devised. It is rather beside the point, however, when one remembers that it is not the purpose of this scale to determine the causes of deficiency, but only to say whether a deficiency in general intelligence is present and to what degree. The causes of the disturbance must then be determined by an expert. Moreover, if one classifies the Binet tests as Meumann has done one may often get valuable clues as to whether the deficiency is mainly in information or in mental process. In seeking the causes of the disturbance, the expert should not overlook the standardization of the Rosanoff and Kent Association Test which has been available for delinquent, feeble-minded and normal children (_174_). It is one of the most important supplementary means for mental analysis which has yet been standardized for practical use. The most complete tables on children's reactions for this test have been published in a _Psychological Monograph_ by Woodrow and Lowell. The importance of more accurate psychological tests in studying mental disturbance is well illustrated by comparing the results that may be obtained with the Binet tests with the desultory, unstandardized tests such as one finds in Dr. Schaefer's Allgemeine gerichtliche Psychiatrie für Juristen, Mediziner, and Pädagogen (_177_), or Dr. Cimbal's Taschenbuch (_91_) prepared for physicians and jurists. Suggestive as these books are for disclosing different mental activities, they give no means of evaluating the disclosures. They show the puerile stage in diagnosis which had been reached before standardized tests were available.