All of these new organs and faculties have been discovered, demonstrated and studied since 1835, my first discoveries, which included a great portion of the whole, having been made by the cranioscopic method of Gall and Spurzheim, in which I found no difficulty in detecting the errors of my predecessors, and discovering the truths which are so patent to one who seeks them. But alas, the dispassionate search for truth is the rarest virtue on earth. Even Gall himself had not enough of this to recognize the discoveries of Spurzheim. Nor had Spurzheim enough to get rid of some of the palpable errors of Gall, such as placing Acquisitiveness in the temples, Mirthfulness in the philosophic group, and reversing the true positions of Tune and Constructiveness, extending the latter into the middle lobe. Spurzheim, however, was a better and more faithful observer than Gall, and greatly improved the science of Phrenology, though he never realized that from the brain we may develop a complete Anthropology. This hasty enumeration of the psychic portion of the demonstrated functions of the brain, which my predecessors failed to reach, will give the reader some idea of the magnitude of the task to discover all this, to establish its relations to anatomy, and, I may add, to cerebral mathematics, and to organize the whole into a harmonious philosophy, which demonstrates itself, when understood, by a divine perfection which is beyond the power of human invention to originate. Perhaps some readers may feel that I should have introduced the subject by systematic demonstrations and narratives of experiments. I avoid this because such narratives would not be attractive to readers who are eager to reach a valuable truth, and do not wish to go through the labors of discovery. Nor am I at all concerned about demonstrations. If I have unveiled eternal truths, my successors, if they are faithful students, will be compelled to see what I have seen, and to verify my observations. I simply KNOW the truth of what I present, from several reasons, each one of which is sufficient in itself.