If I find that my industry and devotion in this matter meet with my readers' approval, I shall be encouraged to translate into Latin the rest of Albrecht's treatise on painting, a work at once more finished and more laborious than the present. Moreover, his writings on other subjects will also be looked for, his Geometries and Tichismatics, in which he explained the fortification of towns according to the system of the present day. These, however, appear to be all the subjects on which he wrote books. As to the promise, which I hear certain persons are making in conversation or in writing, to publish a book by Dürer on the symmetry of the parts of the horse, I cannot but wonder from what source they will obtain after his death what he never completed during his life. Although I am well aware that Albrecht had begun to investigate the law of truth in this matter too, and had made a certain number of measurements, I also know that he lost all he had done through the treachery of certain persons, by whose means it came about that the author's notes were stolen, so that he never cared to begin the work afresh. He had a suspicion, or rather a certainty, as to the source whence came the drones who had invaded his store; but the great man preferred to hide his knowledge, to his own loss and pain, rather than to lose sight of generosity and kindness in the pursuit of his enemies. We shall not, therefore, suffer anything that may appear to be attributed to Albrecht's authorship, unworthy as it must evidently be of so great an artist. A few years ago some tracts also appeared in German, containing rules, in general faulty and inappropriate, about the same matter. On these I do not care now to waste words, though the author, unless I am much mistaken, has not once repented of his publication. But these rules above-mentioned, which are easily proved to be Albrecht's, not only because he prepared them himself for publication, but also because of their own excellence, you will, I think, obtain considerably better here than from other sources. Not that they are more finished in point of erudition and learning in the present book than elsewhere, but because those who interpret them in the author's own workshop, among the expansions and corrections of his autograph manuscripts and the variations of his different copies, stand in the light about many points, which must of necessity seem obscure to others, however learned they may be.