There seems to be a widespread opinion that all criminals and offenders are more or less insane, but those who hold it have nothing to say in support of their view save that they cannot understand how certain crimes could be committed by any sane person. This is to beg the whole question, which is, how many persons who are charged with committing offences are found on examination to be unsound mentally? Insanity has never been satisfactorily defined, but it is a term which in the legal sense connotes irresponsibility. Yet if all insane persons had no sense of responsibility it is difficult to imagine how they could be suffered to live. Even in lunatic asylums the great majority of the inmates can be induced to behave in such a way as to make it unnecessary to tie them up. They have a very large amount of liberty conceded to them without serious inconvenience to their neighbours and greatly to their own advantage. If they simply did what any stray notion impelled them to do this would not be possible. Their affliction frees them from responsibility to the law for their actions; but in practice they have to show by their conduct that they can and will obey the rules of the institution in which they are placed before it is safe or reasonable to let them go freely about in it. The physician does not demand from them better conduct than their mental condition warrants him in expecting; but they learn, in so far as they are capable of learning, that their own actions will determine the degree to which they will be free from interference, and that the necessary result of misconduct will be increased restraint. Only in so far as they show a sense of responsibility is it safe to allow them to be free from supervision. A person may suffer from such a degree of mental unsoundness as will free him from responsibility for his actions in the eyes of the law, and yet be able to conform to the rules laid down for the guidance of his life by an asylum superintendent.