ਜੋ ਜਾਣਿਆ ਹੈ

Not a separate letter in any modern editorial tradition. The Latin Library, Perseus, and Shackleton Bailey all print a single composite letter "13-14" / "14-15" covering the material some older editions split as 13.14 and 13.15. We follow the combined numbering; the text appears under ad-atticum-13-14. Entry retained as a citation anchor.