| Preface | 1 |
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| Chapter I. INTRODUCTION | 3 |
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| PART I. PRACTICAL CONSIDERATIONS |
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| Chapter II. THE FUNCTIONS OF A SCALE IN DIAGNOSIS | 10 |
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| A. The Meaning of Intellectual Deficiency | 10 |
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| B. Forms of Mental Deficiency Not Yet Discoverable by Tests | 14 |
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| C. Doubtful Intellects Accompanied by Delinquency Presumed Deficient | 18 |
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| Chapter III. THE PERCENTAGE DEFINITION OF INTELLECTUAL DEFICIENCY | 20 |
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| A. The Definition | 20 |
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| B. The Assumptions of a Quantitative Definition | 21 |
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| | (a) Deficiency is a Difference in Degree not in Kind | 21 |
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| | (b) As to the Variation in the Frequency of Deficiency at Different Ages | 23 |
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| | (c) As to the Number of Deficients not Detected by Tests | 34 |
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| | (d) Allowance May be Made for Variability | 40 |
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| Chapter IV. WHAT PERCENTAGE IS FEEBLE-MINDED | 47 |
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| A. Kinds of Social Care Contemplated | 47 |
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| B. Estimates of the School Population Versus the General Population | 48 |
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| C. Desirable Versus Immediately Advisable Social Care | 51 |
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| D. Percentages Suggested to Harmonize the Estimates | 52 |
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| E. Comparison With Important Estimates | 56 |
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| F. The Ability of the Mentally Retarded Especially Those Receiving Special Training | 74 |
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| Chapter V. ADAPTING THE PERCENTAGE DEFINITION TO THE BINET SCALE | 82 |
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| A. The Border Region for the Mature | 82 |
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| | (a) Indication from a Random Group | 82 |
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| | (b) The Present Tendency Among Examiners | 95 |
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| B. The Border Region for the Immature | 104 |
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| | (a) For the Binet 1908 Scale | 104 |
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| | (b) Data for Other Developmental Scales | 110 |
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| | (c) The Change in Interpreting the Borderline for the Immature | 116 |
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| Chapter VI. DELINQUENTS TESTING DEFICIENT | 122 |
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| A. At the Glen Farm School for Boys, Hennepin County, Minnesota | 122 |
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| B. Comparison of Tested Deficiency Among Typical Groups of Delinquents | |
