CHAPTER XIX. OF PLACE. Plato, to define place, calls it that thing which in its own bosom receives forms and ideas; by which metaphor he signifies matter, being (as it were) a nurse or receptacle of beings. Aristotle, that it is the ultimate superficies of the circumambient body, contiguous to that which it doth encompass. CHAPTER XX. OF SPACE. The Stoics and Epicureans make a place, a vacuum, and a space to differ. A vacuum is that which is void of any thing that may be called a body; place is that which is possessed by a body; a space that which is partly filled with a body, as a cask with wine. CHAPTER XXI. OF TIME. In the sense of Pythagoras, time is that sphere which encompasses the world. Plato says that it is a movable image of eternity, or the interval of the world’s motion. Eratosthenes, that it is the solar motion. CHAPTER XXII. OF THE ESSENCE AND NATURE OF TIME. Plato says that the heavenly motion is time. Most of the Stoics affirm that motion itself is time. Most philosophers think that time had no beginning; Plato, that time had only an ideal beginning. CHAPTER XXIII. OF MOTION. Plato and Pythagoras say that motion is a change and alteration in matter. Aristotle, that it is the actual operation of that which may be moved. Democritus, that there is but one sort of motion, and it is that which is vibratory. Epicurus, that there are two species of motion, one perpendicular, and the other oblique. Herophilus, that one species of motion is obvious only to reason, the other to sense. Heraclitus utterly denies that there is any thing of quiet or repose in nature; for that is the state of the dead; one sort of motion is eternal, which he assigns to beings eternal, the other perishable, to those things which are perishable. CHAPTER XXIV. OF GENERATION AND CORRUPTION. Parmenides, Melissus, and Zeno deny that there are any such things as generation and corruption, for they suppose that the universe is unmovable. Empedocles, Epicurus, and other philosophers that combine in this, that the world is framed of small corporeal particles meeting together, affirm that corruption and generation are not so properly to be accepted; but there are conjunctions and separations, which do not consist in any alteration according to their qualities, but are made according to quantity by coalition or disjunction. Pythagoras, and all those who take for granted that matter is subject to mutation, say that generation and corruption are to be accepted in their proper sense, and that they are accomplished by the alteration, mutation, and dissolution of elements. CHAPTER XXV. OF NECESSITY.