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...it also seemed fitting to draft a catalog of subjects, arranged into five classes, where a progression is made through all the sciences, arts, and faculties, from the highest to the very lowest of all—namely, from Theology to Grammar. To ensure that what was already written in the first Catalog was not simply rehashed original: "recoquerentur" — literally "cooked again," meaning to repeat redundant information through tiresome and useless repetition, a method was adopted whereby only the names and surnames of the writers who had contributed to a specific subject were listed. These names serve as a guide to direct readers back to the primary Catalog, where the full titles of the books are described under each specific surname. All of this can be more easily understood from the Index of classes and chapters placed at the end of the book than it can be explained here in words. Finally, the reader should be warned that, given the great variety of characters and numbers used, typographical errors were unavoidable. Some of these have been corrected at the end; others are noted within the Appendix, where we have used italics for the names of authors whose book descriptions contained errors. As for any remaining mistakes, the prudent reader will correct them by his own effort original: "suo Marte" — a Latin idiom meaning by one's own skill or strength, referencing Mars as the god of individual prowess.
| Catalog of Authors | page 1 |
| Appendix to the same Catalog | 537 |
| Catalog of Sciences | 583 |
| Index of classes and chapters | 723 |