COMPARATIVE SAGACITY, or Perspicacity, as Gall called it, was a better term than Comparison, which was introduced by Spurzheim. Direct perception of truth is its leading character. Illustration by comparison belongs to the breadth of the forehead, to the Ideal and Inventive region, and is the characteristic of poetry. Spurzheim's description, however, is substantially correct. It qualifies for clear statement, but not for comprehensive or ingenious reasoning. The portion on the median line has still more penetration, in consequence of which it perceives the nature and tendencies of everything, and is enabled to exercise foresight. Still farther in on the median line are located the powers which are more intuitive, and transcending ordinary foresight are entitled to be called prophecy. The CAUSALITY of Spurzheim, or Metaphysical Depth of thought of Gall, was defined with approximate correctness. The immediate perception of causation lies just above the organ of Time, and the special organ of Reason extends therefrom upwards. If the reflective organs of one side of the forehead are divided into an interior and exterior group by a vertical line from the pupil of the eye, the interior group would represent a comprehensive understanding possessing sagacity and judgment, while the exterior would represent profound ingenious thought and originality, a capacity for discovering truth by reason and meditation, by analysis and synthesis, while the interior would discover it only by direct perception. In the exterior group would be included the misnamed organ of Wit or Mirthfulness, which is really a source of philosophy and originality. TUNE and CONSTRUCTIVENESS have really reversed their positions in the maps of Spurzheim and Gall. The inventive faculty of musical composers was what Gall discovered as Music. The sense of Melody and Tune lies behind the brow in connection with the _sense of hearing_, at the anterior portion of Sensibility, which forty years after my discovery is beginning to be recognized in consequence of the experiments of Ferrier on animals. The organ of hearing which he demonstrated in the monkey, occupies the same position in the superior temporal convolution, behind the eye, which I have given it in man, which brings it into close connection with the organs of Language and Tune. Its close connection with the region of impressibility called Somnolence explains its supreme control over our emotions.