Also read Neck Heating Pads Accurate Documents No. 2, relates entirely to the present state of nations in Europe, and the extent, revenue, and population, as represented, are taken from the most accurate documents. Where statistical writers differed, I followed him who appeared to me the most likely to be right. Nos. 3 and 4, relate entirely to England, and are drawn from the most accurate documents. Opposite to each Chart are descriptions and explanations. The reader will find, five minutes attention to the principle on which they are constructed, a saving of much labour and time; but, without that trifling attention, he may as well look at a blank sheet of paper as at one of the Charts. I know of nothing else, in the Book, that requires previous explanation. I think it well to embrace this opportunity, the best I have had, and, perhaps, the last I ever shall have, of making some return, (as far as acknowledgement is a return,) for an obligation, of a nature never to be repaid, by acknowledging publicly, that, to the best and most affectionate of brothers, I owe the invention of those Charts. At a very early period of my life, my brother, who, in a most examplary manner, maintained and educated the family his father left, made me keep a register of a thermometer, expressing the variations by lines on a divided scale. He taught me to know, that, whatever can be expressed in numbers, may be represented by lines. The Chart of the thermometer was on the same principle with those given here; the application only is different. The brother to whom I owe this, now fills the Natural Philosophy Chair in the University of Edinburgh. CHAP. I. Introduction and Plan of the Work.--Explanation of what the Author understands by Wealthy and Powerful Nations, and of the General Causes of Wealth and Power. One of the most solid foundations on which an enquirer can proceed in matters of political economy, as connected with the fate of nations, seems to be by an appeal to history, a view of the effects that have been produced, and an investigation of the causes that have operated in producing them. Unfortunately, in this case, the materials are but very scanty, and sometimes rather of doubtful authority; nevertheless, such as they are, I do not think it well to reject the use of them, and have, therefore, begun, by taking a view of the causes that have ruined nations that have been great and wealthy, beginning with the earliest records and coming down to the present time.