The replies confirm the division, which we have ourselves suggested, of all the abnormal into three groups: (1) The mentally defective; (2) the ill-balanced; (3) a mixed type which includes those who are both mentally defective and ill-balanced. The simply defective do not present any well-defined anomaly of character, but they do not profit, or profit very little, from the ordinary school teaching. The ill-balanced, who might also be called the "undisciplined," are abnormal chiefly in character. They are distinguished by their unruliness, their talkativeness, their lack of attention, and sometimes their wickedness. =The Distribution of Defective Children in the Public Schools.=--In which school divisions do we find these several varieties of children? Let us begin with the mentally defective. These are found chiefly in the junior division, as might be expected. Some manage to reach the intermediate division, but scarcely any reach the senior. The exact distribution is as follows: 75 per cent. in the junior department; 25 per cent. in the intermediate. Let us be more precise with regard to two points--the age of the child and his school position. Some heads of schools, not all, have taken the trouble to satisfy our demands, and have fixed to almost a year the mental retardation of the child as compared with normal children of the same age. The following table summarises these replies, and shows that the majority of cases present a retardation of three years: Mentally defective children with a retardation of-- 0 0 1 year 6 2 years 12 3 " 12 4 " 9 5 " 0 6 " 4 7 " 1 According to a convention, of which we shall speak more fully later, we regard as defective in intelligence a child who shows a retardation of three years, when he himself is nine years of age or more. The results shown above agree with this convention. Moreover, one may draw the conclusion, which is of practical value, that one need not seek children of this group in the senior division of a primary school.