The "History of Scotland, during the Reigns of Queen Mary and James VI.," by Dr. Robertson, was published in 1759, the year of the appearance of Hume's "History of the House of Tudor." It was at once popular; and Hume, writing to him, attributed this to the deference which he had paid to established opinions, the true source of the popularity of many works. This was followed, in 1769, by his "History of Charles V.," and, in 1777, by his "History of America." Robertson's chief characteristic is a sonorous and rather florid style, which extremely pleased his age, but wearies this. His histories drew great attention to the subjects of them at that period; but time has shown that they are extremely superficial, and they have not held their place. [Illustration: DR. JOHNSON. (_After the Portrait by Sir Joshua Reynolds._)] "The History of the Decline and Fall of the Roman Empire," by Gibbon, began to appear in 1776, a few months before the death of Hume, and was not completed till 1788. It consisted of six ponderous quarto volumes, and now often occupies double that number of octavos. It is a monument of enormous labour and research, filling the long, waste, dark space between ancient and modern history. It traces the history of Rome from its Imperial splendour; through its severance into East and West; through its decadence under its luxurious and effeminate emperors; through the ravages of the invading hordes of the North, to the period when the nations of Europe began, in the dawn of a new morning, to rise from the depth of barbarism into life, form, and power. The faults of this great work are, that it is written, like Hume's "History of England," in the sceptical spirit of the period; and that it marches on, in one high-sounding, pompous style, with a monotonous step, over every kind of subject. The same space and attention are bestowed on the insignificance of the feeblest emperors, and the least important times, as on the greatest and most eventful. It is a work which all should read, but a large part of it will be waded through rather as a duty than a pleasure. Still, Gibbon holds his own indispensable position; no other man has yet risen to occupy it better.