This selection will be good, without being final. It will be good, for it is based upon a wide experience extending over several years. Just think what it means in the way of inattention and want of comprehension if a child is three years behind. For our own part, we consider this evidence from experience of the greatest value. It is the obvious point of departure. We can and should try to interpret it and to complete it, but we are not justified in taking no account of it. Let us even say boldly that if, by some unhappy chance, other finer methods should conflict with this, and indicate as defective a child who has shown himself well adapted to school life, it is school life which should be considered the more important test. How, indeed, could one call a child defective who succeeds in his studies and profits by the instruction in the normal way? Thus we sum up by remarking that _we possess a very simple method which enables us to recognise all the children whom we have any right to suspect of mental deficiency_. _This method consists in taking account of the retardation of the children in their studies._ * * * * * For the recognition of the ill-balanced children the rule is the same. The head-master must pick out those children whose undisciplined character has kept them from submitting to the ordinary school régime, and has made them a continual source of disturbance. Whilst the simply defective fail to adapt themselves to school life by reason of their mental deficiency, the ill-balanced fail owing to their inco-ordination of character. In the second case, as in the first, there is a similar defect of adaptation, and the best proof that this defect is present in a particular child is the continued evidence of several years, the testimony of different masters, who declare that, with the best will in the world, they cannot break in the recalcitrant child to rule. But it must be recognised that the appreciation of want of balance is more delicate, more subjective, than that of retardation. The latter is indicated by a definite incontrovertible fact--the insufficiency of instruction. On the other hand, lack of balance has only a slight effect on a child's intelligence and his success in his studies. It is indicated to outsiders especially by the complaints of the masters. And the latter, to tell the truth, may be led to exaggerate a little, especially if they see a means thereby of ridding themselves of children with whom they have not much sympathy. We shall see in a little, when we speak of the rôle of the inspector, how the latter must check the statements of the head-masters.