From a theoretic standpoint, it would not be easy to state all that the physician considers necessary to enable him to make his decision as to individual responsibility. Perhaps, however, the consideration of a series of cases that have attracted widespread attention, and which have been most carefully investigated in all their circumstances, may present the methods of responsible determination better than any set of rules. Three presidents of the United States have been murdered within forty years. The murderers were native-born {303} Americans. In none of the three cases was there any adequate motive for the commission of the crime. The assassin in President Lincoln's case might, it is true, be presumed to have a sufficient political motive, but no entirely sane man could have thought for a moment that any good would be accomplished at that time for the South by the removal of Lincoln. A man of known erratic tendency, with the craving for theatrical effects deeply ingrained in his nature, with a personal history not entirely free from even more serious manifestations of mental disequilibration, and with a family history of more than suspicious character as regards the mental qualities of his ancestors, committed the crime. He met his death at the hands of pursuing soldiers. Such was the temper of the time, that had he been captured alive he would surely have suffered the formal legal death penalty. Even as it was, public sentiment clamoured for legal victims and unfortunately they were found. It seems clear, beyond all doubt, that in this case complete responsibility for his action was not present in the assassin himself. The courts decided later that there had been a conspiracy, but there has always been the feeling that justice was misled by over-zeal to find scapegoats for injured public sentiment. There is no doubt that it is an extremely difficult matter to say what shall be done to the assassin in such a case. The unfortunate result is as much an accident as the fatal consequences of any other perverted natural force. An earthquake may kill its thousands and the inevitable must simply be accepted. Society may protect itself from the further manifestations of such perverse individuals by confining the unfortunate murderer for life, but capital punishment, in the sense of a sanction for broken law, can scarcely be considered to have a place in the given conditions.