Hidden meaning

In the Middle Ages papyrus was scarce and old writing was often scrubbed and painted over to give authors and scribes space to put their words. Some of those old texts were more important than others, such as the writings of Galen of Pergamon. Now, an X-ray fluorescence study has been used by researchers at the University of Manchester, UK, and their colleagues to reveal the (almost) lost writing in one of his medical texts: "On the Mixtures and Powers of Simple Drugs". All of the pages now being scanned will be converted to high-resolution digital images that will be added to those already made freely available online by the Schoenberg Institute for Manuscript Studies at the University of Pennsylvania Libraries.