A striking example of the working out of the three truths which we have given is seen in the consistency of the body. Hard hands, hard muscles, and, in general, a dense, compact, unyielding consistency of fiber, are both inherited and acquired as the result of hard physical labor and the enduring of hardships. As is well known, those who spend their lives in grinding toil in the midst of hard conditions care little for the finer sentiments and sympathies of life. They have no time for them, no energy left for them. By the very necessities of their lot they are compelled to be hostile to change, free from all extravagance, and largely impervious to new ideas. Therefore, wherever we find hardness of consistency we find a tendency to narrowness, parsimony, conservatism, and lack of sympathy. Looking at this fact from a little different angle, we see that, since the body affects the mind and the mind the body so profoundly, the body of hard fiber, being impervious to physical impressions, will yield but slowly and meagerly to those molecular changes which naturally accompany emotional response and intellectual receptivity. These are but a few examples of the truths upon which the science of character analysis by the observational method is based. Many others may occur to you. Many others have been observed, traced and verified in our work upon this science. A BRIEF RECAPITULATION Briefly recapitulating, we see that for every physical difference between men there is a corresponding mental difference, because both the physical differences and the mental differences are the result of the same heredity and environment. We see, further, that these physical and mental differences are not only results of the same environment affecting the individual through his remote ancestry, but that they are tied together by cause and effect in the individual as he stands to-day. BASIS OF CLASSIFICATION We have told you that the science of character analysis is classified knowledge. It is clear to you by this time that the knowledge which lies at the basis of this science is knowledge concerning physical and mental differences and their correspondences. In this science, therefore, since we are to observe physical differences and from them to determine differences in intellect, in disposition, in natural talents, in character in general, our first classification must deal with these physical differences. Men differ from one another in nine fundamental ways These ways are: color, form, size, structure, texture, consistency, proportion, expression, and condition. Let us consider each of them briefly. COLOR Color is, perhaps, the most striking variable. You instantly observe whether a person is white or black, brown or yellow. Indeed, so striking are these variations that they were formerly the basis upon which humanity was divided into races.