SEeing the Succession of Conceptions in the Mind are caused, as hath been said before, by the Succession they had one to another when they were produced by the Senses, and that there is no Conception that hath not bin produced immediately before or after innumerable others, by the innumerable Acts of Sense; it must needs follow, that one Conception followeth not another, according to our Election, and the need we have of them, but as it chanceth us to hear or see such Things as shall bring them to our Mind. The Experience we have hereof, is in such Brute Beasts, which, having the providence to hide the Remains and Superfluity of their Meat, do nevertheless want the Remembrance of the Place where they hide it, and thereby make no Benefit thereof in their Hunger: but Man, who in this Point beginneth to rank himself somewhat above the Nature of Beasts, hath observed and remembred the Cause of this Defect, and to amend the same, hath imagined or devised to set up a visible or other sensible Mark, the which, when he seeth it again, may bring to his Mind the Thought he had when he set it up. A Mark therefore is a sensible Object which a Man erecteth voluntarily to himself, to the End to remember thereby somewhat past, when the same is objected to his Sense again: As men that have past by a Rock at Sea, set up some Mark, thereby to remember their former Danger, and avoid it.