THE RESULTS FROM AN EXPERIMENT TESTING A SERIES OF SIX HYPOTHESES DEDUCED FROM THE DELACATO INTERPRETATION OF NEUROLOGICAL ORGANIZATION ARE PRESENTED. SUBJECTS IN THE 3-MONTH STUDY WERE SECOND GRADERS FROM THE CHICAGO ARCHDIOCESAN SCHOOL SYSTEM WHO REPRESENTED SIMILAR BACKGROUNDS AND SOCIOECONOMIC LEVELS. COMPARISONS WERE MADE OF THE READING AND LATERAL DEVELOPMENT AMONG THE THREE GROUPS OF SECOND GRADERS--THE FIRST GROUP WAS EXPOSED TO THE DELACATO TYPE PROGRAM, THE SECOND WAS EXPOSED TO A NONSPECIFIC OR PLACEBO TYPE PROGRAM, AND THE THIRD ACTED AS TRADITIONAL CONTROLS. IN ADDITION, A SERIES OF COMPARISONS WAS MADE BETWEEN READING AND INITIAL LEVELS OF NEUROLOGICAL ORGANIZATION AND LATERALITY. POST-TESTS WERE ADMINISTERED, AND ALL THREE GROUPS TOOK THE READING TEST. MEMBERS OF THE EXPERIMENTAL GROUP WERE ALSO TESTED IN ARITHMETIC AND LATERALITY. THE TESTS ADMINISTERED WERE THE CALIFORNIA ACHIEVEMENT TEST, THE CALIFORNIA TEST OF MENTAL MATURITY, THE HARRIS TESTS OF LATERAL DOMINANCE, AND A CREEPING TEST. CHI SQUARE, CORRELATION, ANALYSIS OF VARIANCE, AND ANALYSIS OF COVARIANCE WERE USED TO ANALYZE THE DATA. THE RESULTS DID NOT SUPPORT THE REJECTION OF ANY OF THE SIX NULL HYPOTHESES WHICH SUGGESTED THAT THE DELACATO TYPE PROGRAM DID NOT ENHANCE THE LATERAL READING DEVELOPMENT OF THE SUBJECTS AND THAT THE POSTULATED RELATIONSHIP BETWEEN NEUROLOGICAL ORGANIZATION AND READING COULD NOT BE SUPPORTED BY THIS STUDY. THIS ARTICLE APPEARED IN THE "READING RESEARCH QUARTERLY," VOLUME 1, NUMBER 3, SPRING 1966. (BK)