The difficulty of arranging a satisfactory nomenclature for a certain portion of the brain, in consequence of the varying energy of organic action, is very great, and must be met by using the word which will express in a general manner the organic tendency, leaving to the intelligence of the reader to imagine the variations of intensity. In the greatest energy of organic action the opposite faculty is entirely overcome, and the conduct becomes abnormal, for normal action implies the harmonious co-operation of all parts of the brain. Nevertheless, it is in this abnormal or excessive action that we get the true, isolated tendency or function in its naked expression. For example, if we refer to that portion of the brain near the mastoid process, which in its excessive action produces murder, we perceive that as murder is an abnormal action, such a term is not a suitable name for an organ, as it would convey the impression that every human being has a constant murderous impulse, and that the faculty is kept inactive when murder is not committed; from which we might infer that the human constitution is badly planned. Still, it is not to be concealed that murderous violence is the ultimate result of this organ when unrestrained,--that it is the most conspicuous faculty in carnivorous animals, and alas! that it has a terrible and at times predominant action in the masculine portion of the human race. Throughout the greater part of ancient history the murderous violence of this faculty has been as conspicuous in the human race as in the wild beasts. Even to-day, after centuries of so-called civilization and religion, no man's life would be safe if not protected by policemen; and the civilized nations, with a skilful ferocity, devote the major part of their governmental revenues to preparations for international homicide as a defence against the murderous impulse in their neighbors, and to watching or controlling the murderers within their own limits; whose homicidal propensities, however, are not restrained from _mutual homicide_, by agreement, in the warlike form of the duel, which is considered a proper institution to cultivate a martial spirit and promote the efficiency of the army,--ay, and even tolerated in the German system of education, provided that life is not actually sacrificed. Murder is therefore not an improper term to express the consummate energy of this basilar organ, if we at the same time understand its gentler manifestations; and Dr. Gall was a faithful student of nature when he called this faculty the "carnivorous instinct, or disposition to murder," for that is the way that it exhibits in animals, and, unfortunately, in mankind also.