Nature hath a wonderful power of connecting systems with each other, and of propagating that connection through all her works. Thus the constituent parts of a plant, the roots, the stem, the branches, the leaves, the fruit, are really different systems, united by a mutual dependence on each other. Thus in an animal, the lymphatic and lacteal ducts, the blood-vessels and nerves, the muscles and glands, the bones and cartilages, the membranes and viscera, with the other organs, form distinct systems, which are united into one whole. There are, at the same time, other connections less intimate. Thus every plant is joined to the earth by its roots; it requires rain and dews to furnish it with juices; and it requires heat to preserve these juices in fluidity and motion. Thus every animal, by its gravity, is connected with the earth, with the element in which it breathes, and with the sun, by deriving from it cherishing and enlivening heat. The earth furnisheth aliment to plants, these to animals, and these again to other animals, in a long train of dependence. That the earth is part of a greater system, comprehending many bodies mutually attracting each other, and gravitating all toward one common centre, is now thoroughly explored. Such a regular and uniform series of connections, propagated through so great a number of beings and through such wide spaces, is wonderful: and our wonder must increase, when we observe this connection propagated from the minutest atoms to bodies of the most enormous size, and widely diffused, so as that we can neither perceive its beginning nor its end. That it doth not terminate within our own planetary system, is certain. The connection is diffused over spaces still more remote, where new bodies and systems rise to our view, without end. All space is filled with the works of God, which, being the operation of one hand, are formed by one plan, to answer one great end.