Linnaeus experimented with a few filing systems. In 1752, while cataloging Queen Ludovica Ulrica’s collection of butterflies with his disciple Daniel Solander, he prepared small, uniform sheets of paper for the first time. “That cataloging experience was possibly where the idea for using slips came from,” Charmantier explained to me. Solander took this method with him to England, where he cataloged the Sloane Collection of the British Museum and then Joseph Banks’s collections, using similar slips, Charmantier said. This became the cataloging system of a national collection.