For long after the invention of printing the books produced consist mainly of four classes:—(1) Classical, (2) Grammatical, (3) Theological, (4) Legal. The immense proportion of these in comparison with other subjects demonstrates that the great majority of readers belonged to the professional classes—teachers, or at least students at the universities, divines, and practitioners of civil or canon law. Had a leisured and cultured class existed, as in our times, we should have seen more modern history and biography, more essays and facetiæ, more vernacular poetry and fiction—all departments very slenderly represented in the fifteenth century. Men evidently read for practical ends, and invested their money in the expectation of a substantial rather than an intellectual return. The class that now reads principally for amusement, did not in that age read at all; but if it had, books could not then be produced at the cheap rate required to ensure an extensive circulation. If such books are costly, they must at all events be solid, to give the purchaser an apparent return for his money; or the expense must be distributed over a wide area by the agency of circulating libraries, an institution which implies a numerous reading public. Hence, a fact honourable to Renaissance literature, it includes hardly anything that can be called trash. Copious in the number of its publications, it is disappointingly meagre in their themes; many branches of human activity hardly exist for it, but, at all events, almost every one of its publications was produced in response to a real need. Most of them have inevitably become obsolete, few have ever been, or will be, utterly valueless.