It is this terrible uncertainty as to the value of the commodity purchased, which renders publishing a business so difficult, precarious, and unprofitable; and the higher the character of the literature, the greater the difficulty becomes. Publishers who confine themselves chiefly to works of utility and necessity, or to works professional and sectarian, have an easy task to perform, compared with that of a publisher who aims to supply the public with pure science and high literature. If any business can claim favorable consideration from those who have in charge the distribution of the public burdens, surely it is this. If in any way its perils can be justly diminished by law, surely that protection ought not to be withheld. We believe it could be shown that the business of publishing what the trade calls "miscellaneous books," i. e. books which depend solely upon their intrinsic interest or merit, yields a smaller return for the capital and talent invested in it than any other. The Harpers have a grand establishment,--one of the wonders of America. Any one going over that assemblage of enormous edifices, and observing the multitude of men and women employed in them, the vast and far-reaching enterprises going forward,--some of which involve a large expenditure for years before any return is possible,--the great numbers of men of ability, learning, and experience who are superintending the various departments, and the amazing quantities of merchandise produced, the mere catalogue of which is a large volume,--any one, we say, observing these things, would naturally conclude, that the proprietors must be in the receipt of Vanderbiltian incomes. The same amount of capital, force, experience, and talent employed in any other branch of business could not fail to put the incomes of the proprietors high up among those which require six figures for their expression. Compare the returns of these monarchs of the "trade" with those of our dry-goods magnates, and our mighty men in cotton, tobacco, and railroads. A dealer in dry-goods in the city of New York has returned as the _income_ of a single year a sum half as large as the whole capital invested in the establishment of the Harpers. If the _signal_ successes of publishing--successes which are the result of the rarest conjunctions of talent, capital, experience, and opportunity--are represented by incomes of twenty and thirty thousand paper dollars a year, what must be the general condition of the trade? But it is the difficulty of conducting the business at all, not the slenderness of its profits, upon which we now desire the reader to reflect. That difficulty, we repeat, arises from the fact that a publisher buys his pig in a poke. He generally knows not, and cannot know, whether what he buys is worth much, little, or nothing.