In the “Animal Kingdom,” Swedenborg referred solely to the human body, it being the microcosm, or representative of all inferior systems. In the “Economy of the Animal Kingdom,” he treats of the blood, and the organs which contain it; the coincidence of the motion of the brain with the respiration of the lungs; and of the human soul. The method pursued in this work is admirable. A careful series of extracts, containing facts from the best anatomists, is prefixed to each chapter, and thence is deduced the author’s theory. It would be very difficult indeed to present, in an abstract, the substance of these quotations, and without this, (which would be inconsistent with our limits,) the theories could not be fairly understood or appreciated. His demonstration of the coincidence of the motion of the brain with the respiration of the lungs, is well worthy of notice. Wilkinson, speaking of this in his “Biography of Swedenborg,” says: “Let any reader think for a moment of what he experiences when he breathes, and attends to the act. He will find that his whole frame heaves and subsides at the time; face, chest, stomach, and limbs, are all actuated by his respiration. His sense is, that not only his lungs but his entire body breathes. Now mark what Swedenborg elicited from this fact. If the whole man breathes or heaves, so also do the organs which he contains, for they are necessarily drawn outwards by the rising of the surface; therefore they all breathe. What do they breathe? Two elements are omnipresent in them, the blood-vessels and the nerves; the one giving them pabulum, the other life. They draw then into themselves blood, and life or nervous spirit. Each does this according to its own form; each, therefore, has a free individuality like the whole man; each takes its food, the blood, when it chooses; each wills into itself the life according to its desires. The man is made up of manlike parts; his freedom is an aggregate of a host of atomic, organical freedoms. The heart does not cram them with its blood, but each, like the man itself, takes what it thinks right.