ike Jungius, Boyle made use of loose folio sheets that he called memorials or adversaria; yet he did not worry too much about a system of self-referential relationships that enabled intentional knowl-edge retrieval. When he realized that he was no longer able to get his bearings in an ocean of paper slips, he looked for a way out, testing several devices, such as colored strings or labels made of letters and numeral codes. Unfortunately, it was too late. As Richard Yeo clearly noted, ‘this failure to develop an effective indexing system resulted from years of trusting in memory in tandem with notes’.69

Well studied personal experiences, such as those of Joachim Jungius, Robert Boyle, and Secondo Lancellotti,59 represent outstanding exam-ples

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Many scholars, like the 17th-century chemist Robert Boyle, preferred to work on loose sheets of paper that could be collated, rearranged, and reshuffled, says Blair.

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