Ann Gibbons at Science reports on how “Researchers use ancient DNA and proteins to read the biology of books”:
Behind locked doors in one of the oldest libraries in Europe, two dozen scholars mill around a conference table where rare medieval manuscripts perch on lecterns, illuminated by natural light streaming in from floor-to-ceiling windows. Most scholars simply look at these precious books while librarians turn the pages for them. But evolutionary biologist Blair Hedges, wearing gray rubber gloves, approaches one book with a mini–cotton swab. He gently dabs the circumference of a hole in the original white leather binding of a rare 12th century copy of the Gospel of Luke. Then, he inserts a tiny gum brush—the kind teenagers use to clean their braces—into another hole to swab its edges. His goal? “To collect bookworm excrement for ancient DNA analysis,” says Hedges, who works at Temple University in Philadelphia, Pennsylvania.
As Hedges magnifies the holes with a lens on his iPhone, book conservator Andrew Honey of the University of Oxford notices that the holes extend all the way back to the oak boards beneath the binding. Honey suggests that furniture beetles laid eggs in the oak before the bookmaker bound the wood in leather. The larvae lurked there for years before developing into adults that exited through the leather. That means it’s likely that “the holes were made by beetles 900 years ago … the oldest example of wormholes I’ve ever seen,” says Hedges, who uses DNA and the size of the holes to assess the type of beetle and so help identify where books were made; the DNA will also help him trace the evolution of the bookworms themselves. […]
At the symposium, Matthew Teasdale, a postdoc in Dan Bradley’s lab at Trinity College in Dublin, reported on the biology of another valuable text: the York Gospels, thought to have been written around 990 C.E. DNA from this book’s eraser shavings showed that, aside from some sheep, its pages were mostly calfskin—mainly from female calves, which was unexpected because cows were usually allowed to grow up to bear offspring. Historic records report that a cattle disease struck the area from 986–988 C.E., so perhaps many sick and stillborn calves were used for parchment, says zooarchaeologist Annelise Binois-Roman of the Université Paris 1 Panthéon-Sorbonne.
The York Gospels also offer a rare record of the people of the book: Almost 20% of the DNA Teasdale extracted from its eraser shavings came from humans or microbes shed by humans, he announced at the symposium. This is the only surviving Gospel book to contain the oaths taken by U.K. clergymen between the 14th and 16th centuries, and it’s still used in ceremonies today. Pages containing oaths were read, kissed, and handled the most, and these pages were particularly rich in microbial DNA from humans, Teasdale reported.
It’s a great read, with sentences like “The book was comprised of skins from an estimated 8.5 calves, 10.5 sheep, and half a goat.” And its mention of quires led Trevor Joyce, who sent me the link (thanks, Trevor!), to say “it prompted me to try guessing the etymology of quire (I drew a blank).” It’s a nice etymology; to quote Wiktionary:
From Middle English quayer, from Anglo-Norman quaier and Old French quaer, from Latin quaternus (“fourfold”), from quater (“four times”). Doublet of cahier.
We discussed quires themselves back in 2004. And the mention of “Annelise Binois-Roman of the Université Paris 1 Panthéon-Sorbonne” makes me grumpy: aren’t we allowed to just say “of the Sorbonne” any more?
Recent Comments