Anglo-Norman period, which will bring you down to about 1350, when the character styled Black-letter, or Old English, was used, and so on. You will find a fund of historic lore in Hall's History of the Houses of York and Lancaster, Hollingshead's Chronicles, Stowe's Chronicles, Camden's Britannia, Lord Bacon's Henry VII., nearly all of which is in my library. There is one thing, my son, that is indispensable now, and you will find it equally so in all your undertakings through life--and is something in which you are wanting, that is industry and a firm resolution to make yourself master of every study or pursuit in which you engage. Have unity of aim, perseverance, and you must succeed. Most of the miseries and vices of mankind proceed from idleness and a wrong direction given to their energies. I ardently desire your success and the progress you make now will decide whether or not I shall be gratified or disappointed. Address yourself anew to your books, and though from your previous neglect and want of training, you may progress slower than you would wish, and than some would do in your position, I know enough of your parts to feel a perfect conviction that you can reach the goal as certainly as the brightest of your youthful companions. A word more as to your studies. While I consider a knowledge of the languages essential to a gentleman, I regard mathematics as essential to a liberal education, and as, indeed, the most important part of it, mathematics is the perfection of reason, and its peculiar excellence consists in the fact that its principles are demonstratable--especially is this the case in geometry, the most general and important of the mathematical sciences. Every proposition that it lays down is subjected to the most accurate and rigid demonstration. Mathematics is, in fact, the only science whose truths are clearly demonstrated, and whose results are conceded by all rational beings. If you state a proposition in morals, philosophy, in law, politics or religion, which you think correct, you will find few of your listeners willing to acknowledge its truth. You debate the question, but you have no means of deciding who is right. Not so in mathematics. There demonstrations are so clear and conclusive that all rational men yield to them. Hence it has been called the science of certainty. By acquiring mathematics then you acquire a science that you know to be founded upon correct reasoning, and when you are disputing a point of law, politics, theology or morals, you will be enabled to ascertain more certainly those arguments that lead to a correct conclusion, and at the same time with the more ease to discover those that are fallacious and sophistical. He who gives a portion of his time and talents I have somewhere read, to the investigation of mathematical truth, will come to see all other questions with a decided advantage over his opponents. He will be in argument what the ancient Romans were