(7) Anatomy teaches that all fibers descend from the brains through the neck into the body, and that none ascend from the body through the neck into the brains. And where the fibers are in their first principles or firsts, there life is in its first principles or firsts. Will any one venture to deny that life has its origin where the fibers have their origin? (8) Ask any one of common perception where his thought resides or where he thinks, and he will say, In the head. Then appeal to some one who has assigned the seat of the soul to some gland or to the heart or somewhere else, and ask him where affection and thought therefrom are in their firsts, whether they are not in the brain? and he will answer, No, or that he does not know. The cause of this ignorance may be seen above (n. 361). 366. (3) Such as life is in its first principles, such it is in the whole and in every part. That this may be perceived, it shall now be told where in the brains these first principles are, and how they become derivative. Anatomy shows where in the brains these first principles are; it teaches that there are two brains; that these are continued from the head into the spinal column; that they consist of two substances, called cortical substance and medullary substance; that cortical substance consists of innumerable gland-like forms, and medullary substance of innumerable fiber-like forms. Now as these little glands are heads of fibrils, they are also their first principles. For from these, fibers begin and thereupon go forth, gradually bundling themselves into nerves. These bundles or nerves, when formed, descend to the organs of sense in the face, and to the organs of motion in the body, and form them. Consult any one skilled in the science of anatomy, and you will be convinced. This cortical or glandular substance constitutes the surface of the cerebrum, and also the surface of the corpora striata, from which proceeds the medulla oblongata; it also constitutes the middle of the cerebellum, and the middle of the spinal marrow. But medullary or fibrillary substance everywhere begins in and proceeds from the cortical; out of it nerves arise, and from them all things of the body. That this is true is proved by dissection. They who know these things, either from the study of anatomical science or from the testimony of those who are skilled in the science, can see that the first principles of life are in the same place as the beginnings of the fibers, and that fibers cannot go forth from themselves, but must go forth from first principles. These first principles, that is, beginnings, which appear as little glands, are almost countless; their multitude may be compared to the multitude of stars in the universe; and the multitude of fibrils coming out of them may be compared to the multitude of rays going forth from the stars and bearing their heat and light to the earth. The multitude of these little