whereas nothing but some great convulsion in nature is ever likely to destroy the other or remove it from its place. Our particular experience is only to be depended on, as it is explained and confirmed by analogy to other cases, viz. by a number of other facts of the same kind, or by general observation. Secondly, the aggregate of our experience with respect to any given class of events is constantly over-ruled by the _reason of the case_, viz. by our knowledge of cause and effect, by the intelligible, explicit connections of things, and by considering whether the principles concerned in the production of a series of events, (forming a body of facts, or the concrete mass of our experience) are resolvable into a simple law of nature operating universally, unchangeably, without ever being suspended for a moment, (as for instance, the law of gravitation which holds equally of all bodies in all cases, and can never be separated from our reasonings upon them) or whether the event has been owing to a combination of mixed causes, which do not always act alike and with equal force, or the effect of which depends upon circumstances, which we know may be altered, (as in the case of soils, climates, methods of culture,[26] &c. to return to the former example). Suppose a rock to have stood for ages on the summit of a mountain. Am I sure that it will stand there always? Yes, if nothing happens to prevent it. But can I be sure that nothing will ever remove it, because nothing has ever done so hitherto? On the contrary, I know that if a man points a cannon against it, it will be shattered to pieces in an instant, though it has stood there for ages, and though there is not at present the least appearance of a change in it. Here then my experience is of no avail against my reason. In one sense of the word, it is all thrown away, and goes for nothing. To judge rationally, I must take other circumstances into the account, the effects of gunpowder, &c. The resistance made by the rock will depend upon its hardness, not upon the length of time it had stood there. Our experience then is not one thing, or any number of things, taken absolutely or blindly by themselves, but a vast collection of facts, and what is of infinitely more importance, of rules, founded upon those facts, bearing one upon another, and perpetually modified by circumstances. It is not upon any single fact or class of facts, or on any single rule, but on the combination of all these, and the manner in which they balance and control one another, that our decisions must ultimately rest. It is from this rational and abstracted experience that we obtain any certain results, and infer from the altered relation of causes and events, that things will happen which never happened before. The future is contained in the past, only as it grows out of the same powers in nature, but acting in different situations, and producing different practical results by invariable laws. To apply all this to the question.