These definitions of the cardinal classes of life are, it will be noted, obtained from direct observation; they are so simple and so important that I cannot over-emphasize the necessity of grasping them and most especially the definition of Man. For these simple definitions and especially that of Humanity will profoundly transform the whole conception of human life in every field of interest and activity; and, what is more important than all, the definition of Man will give us a starting point for discovering the _natural_ laws of human nature—of the human class of life. The definitions of the classes of life represent the different classes as distinct in respect to dimensionality; and this is extremely important for no measure or rule of one class can be applied to the other, _without making grave mistakes_. For example, to treat a human being as an animal—as a mere space-binder—because humans have certain animal propensities, is an error of the same type and grossness as to treat a cube as a surface because it has surface properties. It is absolutely essential to grasp that fact if we are ever to have a science of human nature. We can represent the different classes of life in three life coordinates. The minerals, with their inorganic activities would be the Zero (0) dimension of “life”—that is the _lifeless_ class—here represented by the point _M_. The plants, with their “autonomous” growth, to be represented by the ONE DIMENSIONAL line _MP_. The animals, with their “autonomous” capacity to grow and to be active in space by the TWO DIMENSIONAL plane _PAM_. The humans, with their “autonomous” capacity to grow, to be active in space AND TO BE ACTIVE IN TIME, by the THREE DIMENSIONAL region _MAPH_. [ A drawing, like labeling the axes of a three-dimensional space. At the center is “(Minerals) M”. At the top of the Z axis is “H (Humans)”. At the end of the X axis is “P (Plants)”. At the end of the Y axis is “A (Animals)”. ]