Dot Porter, Curator, Digital Research Services at the University of Pennsylvania Library, offers a video orientation to Penn Library’s Ms. Codex 1644, a chemical manuscript with instructions for preparing several hundred substances, both pharmaceutical and alchemical. Entries for a few preparations include references to earlier authorities such as Paracelsus, Ruland, and Glauber. The entries in an alphabetical index in two columns at the end of the volume appear to be in Towneley’s hand and to cover the whole volume, but page numbers were added later, both to the manuscript and to the index, only through 194.
You can read the complete record for this document (and find links to digitized copies) on Franklin. You can also download a copy of this video from ScholarlyCommons, the University of Pennsylvania’s open access institutional repository.