Mark Knowles' theories of pharma and other labels

[-JKP-]

Hmmm, I don't know if this is easy or hard to find on the Net.

I read about it years ago (in a book) when I was reading about kabbalah. The one I'm thinking of is not a Caesar cipher, pigpen, or atbash cipher, it was a little more difficult to decrypt (not much, but a little). I remember it being an abbreviated character set (some chars were represented by the same symbols), and I'm reasonably sure it was earlier than the Italian diplomatic ciphers, maybe 14th century or early 15th century?

It was a library book, which means there might be a scan on Google Books, but they all have similar titles and I read several in a row, so I no longer remember which one discussed the less common ciphers, I was simply trying to get a feel for how advanced the technology was at the time.