Instead of jotting down every note, thought, observation, excerpt, andreading on a single slip of paper and leaving them there, Placcius recom-mends grouping them, by dint of appropriate libros excerptorum (see figure2.5),39 excerpt books that follow the pattern that had guided the design ofregisters and bound library catalogs since Konrad Gessner; Placcius citesthe entire section “ De Indicibus Librorum ” from the Pandectae .40 Perhapshis strong vote for the bound form of this storage technology and againstJungius’s method is a way of warning against lifelong knowledge accumula-tions that merely gather treasures without being recombined and pub-lished as new books. Jungius, keen on including new resources, delays hisown publications time and again, leaving them unfinished or simply asraw paper slip potential in storage, on call. 4