1. Twenty boys committed to a state training school for delinquents were studied by the electroencephalographic method.2. Seventeen of these twenty have yielded abnormal records.3. Of the seventeen abnormal records three suggested petit mal epilepsy, three showed irregularly abnormal patterns, and eleven showed a slow square-topped wave formation which we have called psychomotor-like.4. Some favorable results have been achieved in the treatment of a few of these patients with dilantin.