Also read Clocks Political Society The history of three thousand years, and of nations that have risen to wealth and power, in a great variety of situations, all terminating with a considerable degree of similarity, discovers the great outline of the causes that invigorate or degrade the human mind, and thereby raise or ruin states and empires. The utility of this Inquiry is considerably strengthened by the opinion of a writer of great information and first-rate abilities. An historical review of different forms under which human affairs have appeared in different ages and nations naturally suggests the question, whether the experience of former times may not now furnish some general principles to enlighten and direct the policy of future legislators? The discussion, however, to which the question leads is of singular difficulty; as it requires an accurate analysis of by far the most complicated class of phenomena that can possibly engage our attention; those which result from the intricate and often from the imperceptible mechanism of political society--a subject of observation which seems at first view so little commensurate to our faculties, that it has been generally regarded with the same passive emotions of wonder and submission with which, in the material world, we survey the effects produced by the mysterious and uncontrollable operation of physical causes. It is fortunate that upon this, as on many other occasions, the difficulties which had long baffled the effort of solitary genius begin to appear less formidable to the united exertions of the race; and that, in proportion as the experience and the reasoning of different individuals are brought to bear on the objects, and are combined in such a manner as to illustrate and to limit each other, the science of politics assumes more and more that systematical form which encourages and aids the labours of future inquirers. In the following Inquiry I have inserted four engraved Charts, in order to illustrate the subjects treated of in the Book, by a method approved of both in this and in other countries. The Chart, No. 1, representing the rise and fall of all nations or countries, that have been particularly distinguished for wealth or power, is the first of the sort that ever was engraved, and has, therefore, not yet met with public approbation. It is constructed to give a distinct view of the migrations of commerce and of wealth in general. For a very accurate view, there are no materials in existence; neither would it lead to any very different conclusion, if the proportional values were ascertained with the greatest accuracy. I first drew the Chart in order to clear up my own ideas on the subject, finding it very troublesome to retain a distinct notion of the changes that had taken place. I found it answer the purpose beyond my expectation, by bringing into one view the result of details that are dispersed over a very wide and intricate field of universal history; facts sometimes connected with each other, sometimes not, and always requiring reflection each time they were referred to. I found the first rough draft give me a better comprehension of the subject, than all that I had learnt from occasional reading, for half of my lifetime; and, on the supposition that what was of so much use to me, might be of some to others, I have given it with a tolerable degree of accuracy.