However, the most important question of all with the man of letters as a man of business, is what kind of book will sell the best of itself, because, at the end of the ends, a book sells itself or does not sell at all; kissing, after long ages of reasoning and a great deal of culture, still goes by favor, and though innumerable generations of horses have been led to water, not one horse has yet been made to drink. With the best, or the worst, will in the world, no publisher can force a book into acceptance. Advertising will not avail, and reviewing is notoriously futile. If the book does not strike the popular fancy, or deal with some universal interest, which need by no means be a profound or important one, the drums and the cymbals shall be beaten in vain. The book may be one of the best and wisest books in the world, but if it has not this sort of appeal in it, the readers of it, and worse yet, the purchasers, will remain few, though fit. The secret of this, like most other secrets of a rather ridiculous world, is in the awful keeping of fate, and we can only hope to surprise it by some lucky chance. To plan a surprise of it, to aim a book at the public favor, is the most hopeless of all endeavors, as it is one of the unworthiest; and I can, neither as a man of letters nor as a man of business, counsel the young author to do it. The best that you can do is to write the book that it gives you the most pleasure to write, to put as much heart and soul as you have about you into it, and then hope as hard as you can to reach the heart and soul of the great multitude of your fellow-men. That, and that alone, is good business for a man of letters.