Defective 75 73 68 Not defective 25 27 32 Average number of grades completed by pupils having no physical defects, compared with the number completed by those suffering from different defects: 3304 Children, 10-14 years, grades 1-8 Average grades completed % lost Children having no physical defects 4.94 Children having enlarged glands 4.20 14.9 Children having defective vision 4.94 0 Children having defective breathing 4.58 7.2 Children having defective teeth 4.65 5.9 _Children having hypertrophied tonsils_ _4.50_ _8.9_ _Children having adenoids_ _4.24_ _14.1_ Children having other defects 4.52 8.5 Cornell reports several investigations in the Psychological Clinic, January and May, 1908. Three of these, in which children were rated on the basis of grades received in school work, are here combined to show the grades of normal children, "average" children, generally defective children, those possessing adenoids and tonsils, and the deaf. General Adenoids No. of cases Normal Average Defective and Tonsils Adenoids Deaf Allison 219 9th St. 64 84 21 8 Claghorn 179 252 13 Grade in language 9th St. 72.9 70.5 63.3 60 Claghorn 74.4 72.7 71.4 Grade in Arith. 9th St. 75.5 74 70 66.7 Claghorn 72 70 65.1 Grade in spelling 9th St. 75.4 72.8 64.8 65 Grade in geography Claghorn 76.6 76.5 76.2 Average of grades Allison 75 74 72.6 72 67 9th St. 74.6 72.4 66 63.9 Claghorn 74.3 73.1 0.8 An additional investigation of four classes in the same grammar grade of the Claghorn School gives the following results: Class 1 Class 15 Class 9 Class 11 Bright Children Dull Dullest Number of children 50 39 32 29 Normal 36 32 20 13 Defective 14 7 12 16 Percentage of normal 72 82 62.5 44.8 In the same article, Dr. Cornell gives the results of another study of Philadelphia schools, made in 1906. The study comprised a comparison of children exempt from examinations on account of high standing, with those not exempt. The results follow: