From the character of the books, one might judge that they had been printed for the use of some school, and at the suggestion, or under the direction, of the authorities of the church. The _Abecedarium_ was a primer for small children. The books most frequently published, the _Donatus_ and the _Doctrinal_, were those most needed by very young scholars. [p294] The _Couplets of Cato_, the curt treatise on the _Roman Law_, and the _Praise of the Iliad_, are, in size and subject, the books that would be suitable for a boy’s school in the middle ages. The _Treatises_ of Saliceto and Torquemada, the _Witty Sayings of Great Men_ and the _Eulogy_ of Pope Pius II, may also be included in the list of books that were intended to be used in schools for the teaching of morals. The character of these works is more juvenile than that of any other typographic printer of that century. Whoever compares them with the ponderous theological works that were printed by Mentel, Gutenberg and Schœffer, and by numerous printers in Germany, and subsequently in the Netherlands, will at once see that this unknown printer made books for boys where other printers made books for men. Probably he could secure no other buyers. His workmanship was so rude that it could not be sold to an intelligent or critical reader. His process was suitable only for the cheapest work and the simplest tastes. [Illustration: 1. Experimental Letters Drawn on Wood. [From De la Borde.]] [Illustration: 2. Experimental Letters Drawn on Wood. [From De la Borde.]] [Illustration: 3. Types made from the Experimental Letters.[150] [From De la Borde.]]