"Nothing that ever was devised by man has put in his hands so powerful an instrument to know himself, as that which we (phrenologists) have given him; for, if he believes in us, he cannot deny the evidence of his own organization. The first key to unlock the hearts of others is that which opens our own; and to know whether we judge our neighbour fairly or not, we should measure the quantity of our own feelings which we mix up in the judgment. But from this acquaintance with ourselves and others may result the greatest benefit that could accrue to social intercourse, mutual indulgence. When we recollect that each has his own particular organization, as we have ours; that it is not easy to controul the dispositions which nature has thus implanted in our minds; that we have defects as insupportable, perhaps, as any that we encounter, we shall be more disposed to bear with others' foibles, that they may pardon ours; and mutual necessity will make us tolerant. "A still higher function of phrenology, as it relates to mankind at large, not merely to the few unfortunates who labour under malady, is its empire over education. The vast error, that men are alike fitted for all professions, that all can turn their mental powers to the same account and profit, has done much injury to the education of individuals, and consequently to the general progress of the world. But our science (continue Drs. Gall and Spurzheim) shows that all men are not alike fitted for all purposes; that, in one, a receptiveness for musical, in another for mathematical instruction predominates; that some are endowed with the power of prompt perception, and others with that of abstruse induction; in short, that every walk of social life has its destined votaries. Now, it is to be hoped, that when parents have the authority of phrenology for the talents and disposition of their children, they will cultivate those which nature has made the most salient in their cranium, and not torment them with studies for which they have no sufficient organ. Should one of their boys, in defiance of birch-rods and ferulas, neglect his vocabulary to carve his taw, or cut out waggon-wheels with his penknife, let them consult one of us, and we will tell them that all the betula of Windsor forest will not make a scholar of him; we will show that, not being one of the ox-eyed, he can but ill remember words, but that having a fulness in the frontal bone just above the spheno-temporal suture, he may become an expert mechanic, an engineer, a mill-wright, or a Watt; that it is in vain to thrust in through the gluteus maximus what cannot penetrate the head; and that flog him as they may, his _propria quæ maribus_ will always be covered with chips and chisels.