CHAP. VI. _Miscellaneous Questions and Observations concerning the Doctrine of Money and Coin._ In deducing the principles of every branch of politics, it is of great importance, at setting out, to treat every one separately; to avoid intricate combinations of circumstances; and to learn how to distinguish between the operations of the general principle in question, and the influence of an accidental circumstance, which may throw the decision of a particular case upon a principle different from that upon which our attention is fixed at the time. Let the combination and complication of circumstances be ever so great, all and every one of them constantly remain under the influence of one principle or other. The great art, therefore, is to have the whole plan of the science so ready at command, as to be able to combine and apply every principle of it to the case proposed. From this we discover of what importance it is to be exactly informed as to facts, and how utterly insufficient the best theory is in the hands of any person, who is not at the same time a thorough practitioner in the political science. In treating of the application of principles to particular cases, we must constantly go upon this hypothesis, that in the case proposed there are no unknown circumstances, which may be repugnant to the exact combination of those which have entred into our supposition. [Sidenote: The use of a miscellaneous chapter at the end of a subject.] The use, therefore, of a miscellaneous chapter, after the deduction of the general principles is over, is to serve as an exercise upon them. This is done by introducing questions which may tend to illustrate or explain the matters already treated of, and which have not been introduced in the body of the work, for fear of rendering combinations too complicated, and of drawing the attention from the main object of inquiry. When a particular appearance, also, seems to contradict a known principle, that appearance may here be analized, and the particularity of the case pointed out, and ranged under the principle which influences it. Numbers of objections also occur to readers of such inquiries, and which even naturally occur to the author himself, although he be obliged to take no notice of them at the time, for fear of interrupting his subject; these may properly find a place in a subsidiary chapter. It is, however, to no purpose to attempt to exhaust any political subject. The combinations of circumstances are infinite; and therefore people must content themselves with deducing all the principles by which they may be resolved, leaving the rest to the reader’s ingenuity. [Sidenote: Quest. 1. Why does the doctrine of money appear so intricate?] QUEST. I. The first question I shall propose for illustrating this subject shall be, Whence it comes to pass that the doctrine of money is so extremely difficult and involved?