Text leaf in mirror-script (untranscribed)

This leaf is densely written in mirror-script, organised into several paragraphs each opened by a short heading, and bears no diagrams. Parts of the ink are lightly rubbed but the script stays largely legible. The bundle carried no transcription, so the wording is left untranscribed rather than read from the image; adjacent drawn folios in this run concern light, shadow and vision. Further untranscribed writing, including a few lines at the foot, is present on the page.