We can understand without difficulty why the eighteenth century was a period favourable to the growth of excellent letter-writing. There were very few newspapers, and those which appeared were low in tone and ill-informed--political pamphleteers abounded and the essayists on morals and manners were numerous--but it was chiefly by private hands that accurate information and ideas were circulated in a small and highly cultivated society with an exquisite taste in literature, with a keen interest in public affairs, and a very strong appetite for philosophic discussion. Side by side with the intellectual conditions we may take into account the national circumstances of that age. The post was expensive, with a slow and intermittent circulation, so that letters, being infrequent, were worth writing carefully and at length; while correspondents were nevertheless not separated by distances of time and space sufficient to weaken or extinguish the desire of interchanging thoughts and news. For it is within the experience of most of us that the difficulty of keeping up regular correspondence increases with distance; that friends who meet seldom write to each other rarely; and that, although letters are most valued by those who are far from home and long absent, yet it is precisely in the case of prolonged separation that the chain of friendly communication is apt gradually to slacken until it becomes entirely disconnected. So long, indeed, as men depended for news on private sources, there was always a kind of obligation to write; but the telegraph and the newspaper have now monopolised the Intelligence Department. On the whole, it may be concluded that the art of letter-writing flourishes best within a limited radius of distance, among persons living neither very near to each other nor yet far apart, who meet occasionally yet not often, and who are within the same range of social, political, and intellectual influences. Its best period is probably before the advent of copious indefatigable journalism, before men have taken to publishing letters in the morning papers, and when they have not yet acquired the economical habit of reserving all their valuable ideas and information for signed articles in some monthly review.