=The Frequency of the Mixed Type, at once Defective and Ill-Balanced.=--The third category of defective children which we have suggested includes those of a mixed type, who are at once mentally defective and ill-balanced. We shall not be surprised to find that these subjects have characters which are the mean of those of the defective and the ill-balanced, since they unite in themselves the two different forms of abnormality. Thus, as regards their intelligence, one finds that none of them are in the senior division; the majority are in the junior division (71 per cent.), and the remainder (29 per cent.) in the intermediate division, which proves that they are on the average less intelligent than the simply ill-balanced, and more intelligent than the simply defective. But we need not dwell on such details, which are easy to understand and even to foresee. The most important question is the number of the mixed cases. The groups of the two simple types are almost equal in number.[2] On the other hand, we find only twenty-one mixed cases in a population where the ill-balanced which have been notified to us amount to forty-four, and the defective to fifty-seven, so that the mixed cases represent only a fifth of the whole, whereas the simple cases form four-fifths. These very different proportions indicate that as a general rule mental instability and mental deficiency are quite distinct. They are not aspects of a single pathological condition, but are two quite independent pathological conditions which may coexist in the same subject, just as happens, for example, in the case of alcoholism and epilepsy, but which are none the less distinct, since as a rule they do not coexist. =Psychological Description of the Mentally Defective.=--Now let us take a closer look at the children who are going to be pupils in our schools for defectives. In looking over the replies to our questionnaire, we are struck by the recurrence of certain phrases, by which the teacher attempts to sum up the defective child. Here are some examples of such phrases. They represent only general impressions, but the frequency of similar impressions arrests one's attention. _Charles_ does the best he can. _Augustine_ is very attentive. _Emile_ is very obedient and gentle. _Paul_ is always making himself useful in little ways. _Marcelle_ is obliging and polite. _Jeanne_ blushes on the slightest occasion. Severity paralyses _Ernestine_ and makes her lose what little wits she possesses. _Camilla_ smiles whenever anyone speaks to her, and immediately does what she is told. _Louis_ is very biddable. _Angela_ does not answer back when her companions tease her, and takes the blame herself. _Eugenie_ is affectionate and is loved by her companions who make her join in their games. Although she herself is fifteen, it was a child of eight who taught her to read and write.