Note: Project Gutenberg also has an HTML version of this file which includes the original illustrations. See 52826-h.htm or 52826-h.zip: (http://www.gutenberg.org/files/52826/52826-h/52826-h.htm) or (http://www.gutenberg.org/files/52826/52826-h.zip) Images of the original pages are available through Internet Archive. See https://archive.org/details/deficiencydelinq00mine Transcriber's note: Text enclosed by underscores is in italics (_italics_). Text enclosed by equal signs is in bold face (=bold=). A carat character is used to denote superscription. A single character following the carat is superscripted (example: 12^2). Educational Psychology Monographs This volume, which is No. 21 in the Series, was edited by J. Carleton Bell DEFICIENCY AND DELINQUENCY An Interpretation of Mental Testing by JAMES BURT MINER, LL.B., PH.D. Associate Professor of Applied Psychology, Carnegie Institute of Technology, Pittsburgh; sometime lecturer at the school for teachers of special classes, Minnesota State School for the Feeble-Minded Baltimore Warwick & York, Inc. 1918 Copyright, 1918 Warwick & York, Inc. DEFICIENCY AND DELINQUENCY TABLE OF CONTENTS Preface 1 Chapter I. INTRODUCTION 3 PART I. PRACTICAL CONSIDERATIONS Chapter II. THE FUNCTIONS OF A SCALE IN DIAGNOSIS 10 A. THE MEANING OF INTELLECTUAL DEFICIENCY 10 B. FORMS OF MENTAL DEFICIENCY NOT YET DISCOVERABLE BY TESTS 14 C. DOUBTFUL INTELLECTS ACCOMPANIED BY DELINQUENCY PRESUMED 18 DEFICIENT Chapter III. THE PERCENTAGE DEFINITION OF INTELLECTUAL DEFICIENCY 20 A. THE DEFINITION 20 B. THE ASSUMPTIONS OF A QUANTITATIVE DEFINITION 21 (a) Deficiency is a Difference in Degree not in Kind 21 (b) As to the Variation in the Frequency of Deficiency at 23 Different Ages (c) As to the Number of Deficients not Detected by Tests 34 (d) Allowance May be Made for Variability 40 Chapter IV. WHAT PERCENTAGE IS FEEBLE-MINDED 47 A. KINDS OF SOCIAL CARE CONTEMPLATED 47 B. ESTIMATES OF THE SCHOOL POPULATION VERSUS THE GENERAL 48 POPULATION C. DESIRABLE VERSUS IMMEDIATELY ADVISABLE SOCIAL CARE 51 D. PERCENTAGES SUGGESTED TO HARMONIZE THE ESTIMATES 52 E. COMPARISON WITH IMPORTANT ESTIMATES 56 F. THE ABILITY OF THE MENTALLY RETARDED ESPECIALLY THOSE 74 RECEIVING SPECIAL TRAINING