A curious discovery in an old prayer book

From National Geographic comes this story:

New Layer of Ancient Greek Writings Detected in Medieval Book
At first glance, the manuscript appears to be a medieval Christian prayer book.

But on the same pages as the prayers, experts using a high-tech imaging system have discovered commentary likely written in the third century A.D. on a work written around 350 B.C. by the Greek philosopher Aristotle.

The discovery is the third ancient text to emerge from the layers of writing on the much reused pages. In 2002 researchers had uncovered writings by the mathematician Archimedes and the fourth-century B.C. politician Hyperides.

Last year one of the pages was found to contain a famous work by Archimedes about buoyancy that had previously been known only from an incomplete Latin translation.

Project director William Noel, curator of manuscripts at the Walters Art Museum in Baltimore, Maryland, called the latest discovery a "sensational find."

The findings were presented today at a general meeting of the American Philosophical Society in Philadelphia, Pennsylvania.

Reuse, Recycle
The book, known as the Archimedes Palimpsest, was first analyzed in 1906, when a Danish researcher recognized that it contained works by the ancient mathematician.

In the 10th century a scribe had copied the ancient Greek manuscripts from papyrus scrolls onto parchment�thin leaves of treated animal skin.

Later the writing was washed out using a solvent such as orange juice and overwritten with new text�a process known as palimpsesting.

"In those days, parchment writing materials were so valuable that they were commonly reused when the book was considered out of date or if the subject was judged inappropriate or less valuable," Roger L. Easton, of the Rochester Institute of Technology, wrote in an email.

And a bit more, starting with the comment by the person who discovered the writing:

"Even though I couldn't read ancient Greek, just the fact that I could see the words gave me shivers," Easton told BBC News.

Experts on ancient Greek texts are currently scouring the newfound work.

Clues, such as a name in the margin, indicate that the writings are an early commentary on Aristotle's Categories, one of the foundations of Western studies of logic.

"If this is the case, then it is an immensely significant find and very exciting," said David Evans, professor of logic and metaphysics at Queens University Belfast in Ireland.

Very cool discovery. The technique used is non-destructive so any text can be examined. What other secrets are out there...