My paper was announced with the above heading through inadvertance, but it does not matter, as there can be but one scientific consideration of the subject, and whatsoever pertains to the medical features of this derangement necessarily concerns the legal, as a broken head or leg should be nothing else in law than what they are in medicine. There are, however, artificial matters not properly involved in the question of the real existence of injuries of any kind, that burden law books and works on medical jurisprudence. The fact that there may be a preponderance of subjective symptoms in alleged concussion cases does not make such accidents peculiar in a medico-legal sense, for several forms of insanity and many physical ailments, at times, discussed in courts possess this same disadvantage. But turning from those rather hackneyed matters let me present a fresh aspect of the subject in