The uncertainty on this borderland may be illustrated by the following case. W. T. is a boy of fifteen, a very small ugly-looking lad, with a small head, low in the forehead, larger in the back, high narrow palate, heavy sullen aspect, and slight external squint of left eye. His father and mother are healthy and sober people; one of the father’s uncles died in an asylum, and one of his aunts committed suicide. The boy had convulsions at the age of eighteen months, and was very backward in walking and speaking; at the age of twelve he could not dress himself. At school he was very dull, apt to strike his companions if roused, solitary, fond of reading, but not remembering what he had read. His schoolmaster, an experienced teacher, had never known so peculiar a boy. But he was not a bad or untruthful lad, and had no vices. When he left school his father tried to teach him his own trade of shoemaking; but, though he had no special distaste for the work, he could not learn even the most elementary part of the trade. Other boys made fun of him, and he complained of his little sister, ten years of age, doing the same. One day, when he had been left quietly sitting alone with this sister, he took up his father’s hammer, which was at his feet, and struck her, smashing in her skull. Then he locked the back door, as he always did on leaving home, and went out, closing the front door after him. He returned in an hour, wet from the rain which had begun to fall. He was taken to prison, and from the first displayed no emotion; he ate and slept well, and was a good, docile boy. The judge who tried him (Lord Coleridge) was evidently in favour of a verdict of manslaughter. The jury fell in with this suggestion, although the authority of Dr. Savage was in favour of insanity, and the boy was condemned to ten years’ penal servitude.[2] Such a case shows very well the inaccuracy of our hard and fast lines of demarcation. Here was a person clearly of abnormal or degenerate character, and liable to sudden violent impulses; he would nowhere be popularly recognised as insane, and possibly it is not desirable that he should be so recognised. On the other hand, he cannot correctly be termed an instinctive criminal; he is on the borderland between the two groups, and a touch may send him in either direction.