What this site holds under Harpocration is a Greek Letter to Caesar Augustus: Alexandria, Nechepso, and Asclepius on plants and stars.
The writer greets Augustus, says he trained in γραμματική in Asia, went to Alexandria, sat with φιλόλογοι and dialectical physicians, found a book of Nechepso, bungled the solar pastille, and in grief left the city. At Diospolis he obtained a rite and spoke with Asclepius. As the letter tells it, Nechepso knew the sympathies of stones and plants but not the times and places of the stellar ἀπορροαί.
The name on the letter is perhaps Harpocration of Alexandria. It is this letter, not a medical system.
Available Works
Letter to Caesar Augustus
Ἐπιστολή
20 passages
Also published as PDF.