Comparing the results of the different testings, a progressive and remarkable improvement was found. In ability to memorise, the average improvement for the group was 19 per cent.; in attention power, 60 per cent.; in adding, 35 per cent.; in ability to associate words having an opposite meaning, 129 per cent.; and in general association ability, 42 per cent. More than this, and testifying incontrovertibly to the direct influence of the dental treatment in promoting vigour of thought, only one of the children failed of promotion, six completed thirty-eight weeks of school-work in twenty-four weeks, and one boy did two years’ work in one year. Yet all of these children, remember, had formerly been quite unable to keep up with the work of their grades. How explain this great improvement? Only on the theory that, by repairing their teeth and drilling them in the rudiments of mouth hygiene, a stop had been put to a disease-process which involved both nervous strain and—through the swallowing of the toxic products of tooth-decay—a poisoning of the supply of blood to the brain, with consequent lessening of the brain’s ability to function properly. Eye trouble, particularly in the way of hypermetropia, or far-sightedness, is another frequent cause of laziness in school-children, and the correction of the defective vision often is followed by a marked access of vigour and alertness. In such cases, however, the laziness is usually manifest only in the school-room, the child being active enough at play, when no strain is put on the eyes comparable with that occasioned by reading. To cite a single instance, a little boy of ten was reported as being so inattentive at school and so uninterested in his work as to yawn and become sleepy when required to read. As no amount of scolding sufficed to turn him from his idle ways, and as he began to complain of headaches and nervousness, he was finally taken to an oculist. To the surprise of his parents, who had always believed his vision normal, he was found to be suffering from latent hypermetropia; and, on being provided with the proper eye-glasses, he soon demonstrated, by the rapidity with which he improved in his studies and the interest he now showed in them, that his laziness had been determined by the condition of his eyesight.