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1858.]. It is always the act of a simple substance, never of a compound. And "in simple substances there is nothing but perceptions and their changes."

He differs from Locke, furthermore, on the question of the origin of ideas. This question, he says, "is not a preliminary one in philosophy, and one must have made great progress to be able to grapple successfully with it."—"Meanwhile, I think I may say, that our ideas, even those of sensible objects, viennent de nôtre propre fond I am by no means for the tabula rasa of Aristotle; on the contrary, there is to me something rational (quelque chose de solide) in what Plato called reminiscence. Nay, more than that, we have not only a reminiscence of all our past thoughts, but we have also a _presentiment_ of all our thoughts."

Mr. Lewes, in his "Biographical History of Philosophy," speaks of the essay from which these words are quoted, as written in "a somewhat supercilious tone." We are unable to detect any such feature in it. That trait was wholly foreign from Leibnitz's nature. "Car je suis des plus dociles," he says of himself, in this same essay. He was the most tolerant of philosophers. "Je ne méprise presque rien."—"Nemo est ingenio minus quam ego censorio."— "Mirum dictu: probo pleraque quae lego."—"Non admodum refutationes quaerere aut legere soleo."

To return to the monads. Each monad, according to Leibnitz, is, properly speaking, a soul, inasmuch as each is endowed with perception. But in order to distinguish those which have only perception from those which have also sentiment and memory, he will call the latter souls, the former monads or entelechies.

The naked monad, he says, has perceptions without relief, or "enhanced flavor"; it is in a state of stupor. Death, he thinks, may produce this state for a time in animals. The monads completely fill the world; there is never and nowhere a void, and never complete inanimateness and inertness. The universe is a plenum of souls. Wherever we behold an organic whole, (unum per se,) there monads are grouped around a central monad to which they are subordinate, and which they are constrained to serve so long as that connection lasts. Masses of inorganic matter are aggregations of monads without a regent, or sentient soul (unum per accidens). There can be no monad without matter, that is, without society, and no soul without a body. Not only the human soul is indestructible and immortal, but also the animal soul. There is no generation out of nothing, and no absolute death. Birth is expansion, development, growth; and death is contraction, envelopment, decrease. The monads which are destined to become human souls have existed from the beginning in organic matter, but only as sentient or animal souls, without reason. They remain in this condition until the generation of the human beings to which they belong, and then develope themselves into rational souls. The different organs and members of the body are also relatively souls which collect around them a number of monads for a specific purpose, and so on ad infinitum. Matter is not only infinitely divisible, but infinitely divided. All matter (so called) is living and active. "Every particle of matter may be conceived as a garden of plants, or as a pond full of fishes. But each branch of each plant, each member of each animal, each drop of their humors, is in turn another such garden or pond."

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