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 glands may also be compared to the multitude of angelic societies in the heavens, which also are countless, and, I have been told, are in like order as the glands. Also the multitude of fibrils going out from these little glands may be compared to the spiritual truths and goods which in like manner flow down from the angelic societies like rays. From this it is that man is like a universe, and like a heaven in least form (as has been frequently said and shown above). From all which it can now be seen that such as life is in first principles, such it is in derivatives; or such as it is in its firsts in the brains, such it is in the things arising therefrom in the body.