The writer reports his views and conclusions on mental retardation, which have been acquired after many years of intensive clinical study. The studies have been made from all possible points of view-hereditary, physical, intellectual, emotional, economic and sociologic.
"Sixty distinguishable conditions have been reported." The relation of retardation to such conditions as height and weight, condition of tonsils and adenoids, ocular defects, defects of other sense organs, diseases, handedness, speech and conditions in the home, normal children being used for comparison, was made and tabulated for large groups of children by different observers working independently. Physical and mental tests and methods of testing are carefully described. The author also attempts to determine for each patient the more important factors contributing to the retardation.
In the majority of cases the mental retardation is ascribed to a general inferiority of intellectual capacity, presumably inborn. In summarizing several large series of cases on