It was about four years before the commencement of the present century, that Gall appears to have begun to deliver lectures on the structure and external appearances of the human head. He tells us, that his attention was first called to the subject in the ninth year of his age (that is, in the year 1767), and that he spent thirty years in the private meditation of his system, before he began to promulgate it. Be that as it will, its most striking characteristic is that of marking out the scull into compartments, in the same manner as a country delineated on a map is divided into districts, and assigning a different faculty or organ to each. In the earliest of these diagrams that has fallen under my observation, the human scull is divided into twenty-seven compartments. I would say of craniology, as I have already said of physiognomy, that there is such a science attainable probably by man, but that we have yet made scarcely any progress in the acquiring it. As certain lines in the countenance are indicative of the dispositions of the man, so it is reasonable to believe that a certain structure of the head is in correspondence with the faculties and propensities of the individual. Thus far we may probably advance without violating a due degree of caution. But there is a wide distance between this general statement, and the conduct of the man who at once splits the human head into twenty-seven compartments. The exterior appearance of the scull is affirmed to correspond with the structure of the brain beneath. And nothing can be more analogous to what the deepest thinkers have already confessed of man, than to suppose that there is one structure of the brain better adapted for intellectual purposes than another. There is probably one structure better adapted than another, for calculation, for poetry, for courage, for cowardice, for presumption, for diffidence, for roughness, for tenderness, for self-control and the want of it. Even as some have inherently a faculty adapted for music or the contrary(40). (40) See above, Essay II. But it is not reasonable to believe that we think of calculation with one portion of the brain, and of poetry with another. It is very little that we know of the nature of matter; and we are equally ignorant as to the substance, whatever it is, in which the thinking principle in man resides. But, without adventuring in any way to dogmatise on the subject, we find so many analogies between the thinking principle, and the structure of what we call the brain, that we cannot but regard the latter as in some way the instrument of the former.