Copernicus

What are original editions worth?

At nearby Margaret Clapp Library at Wellesley College, students have been able to pore over the 1566 printing of Copernicus’s On the Revolutions of the Heavenly Spheres.  It’s the third such “threshold work” for science-the Library has first printings of Charles Darwin’s On the Origin of Species and Isaac Newton’s Principia Mathematica-in the Wellesley collection.  Reading about this acquisition made me think: How different is the experience of reading a first or second printing?  Does more power lie in the text, or the book? What sort of impact does it have on a student’s study?