The ascending half is divided into two moieties, of which one is the science of Physics, the other of Metaphysics. In distinguishing these two, Bacon so far agrees with antiquity as to say,--"That Physic supposes in nature only a being and moving and natural necessity; whereas Metaphysic supposes also a Mind and Idea. For that which I shall say comes perhaps to this."[52] Or, to put it in another light, he writes elsewhere:--"Physique, taking it according to the derivation, and not according to our idiom for medicine, is situate in a middle term or distance between natural history and Metaphysique. For natural history describeth the variety of things; Physique, the causes, but variable or respective causes; and Metaphysique, the fixed and constant causes."[53] In order to clear the way for _his_ Metaphysic of the future, Bacon subjects what had been called by that name to a critical process. He separates from it a kind of theoretical philosophy, the attainment of which he considered doubtful, though he desired that it should be attempted, as the ultimate goal of human wisdom. The object of the separation is, therefore, to leave his metaphysical science within the limits of what is certainly attainable,--a fact not to be lost sight of in its relation to the abstract subjects in which we are now specially interested. The separated realm of knowledge Bacon calls "First and Summary Philosophy"; it is a "common ancestor to all knowledge,"[54] whereas Metaphysic belongs to the philosophy of Nature. It is at the apex of his pyramid of knowledges,[55]--the basis being a collection of natural facts--the "stage next the basis," (an investigation of causes variable and immersed in material existence,) is called "Physique--the stage next the vertical point is Metaphysique."[56] To enter clearly into Bacon's meaning, two questions should be answered: one, what was the wisdom that older Metaphysicians pursued, respecting which he did not himself feel sanguine? and the other, what remained in his thought the province of practical Metaphysique? It is obvious that a wisdom which shall gather up all that every other realm of wisdom produces, cast it into Thought's winepress, and extract the rarest vintage of Truth, has been the vision of every age since men began to inquire and to reason. If this wisdom were possible, it would become to us an alphabet of the Universe; we should obtain a clear insight into the world as it is, and the foregone work of its Creator. Each of us might truthfully say:-- "Der du die Welt umschweifst, Geschäftiger Geist, wie nah' fühl ich mich dir!"